122 (one hundred
ndtwenty-two) is the natural number following
121 121 may refer to:
*121 (number), a natural number
*AD 121, a year in the 2nd century AD
*121 BC, a year in the 2nd century BC
*121 (Eagle) Sqn
*121 (MBTA bus)
*121 (New Jersey bus)
*Road 121, see list of highways numbered 121
*Russian cruiser Mosk ...
and preceding
123.
In mathematics
122 is a
nontotient
In number theory, a nontotient is a positive integer ''n'' which is not a totient number: it is not in the range of Euler's totient function φ, that is, the equation φ(''x'') = ''n'' has no solution ''x''. In other words, ''n'' is a nontotien ...
since there is no integer with exactly 122
coprime
In mathematics, two integers and are coprime, relatively prime or mutually prime if the only positive integer that is a divisor of both of them is 1. Consequently, any prime number that divides does not divide , and vice versa. This is equivale ...
s below it. Nor is there an integer with exactly 122 integers with common factors below it, making 122 a
noncototient In mathematics, a noncototient is a positive integer ''n'' that cannot be expressed as the difference between a positive integer ''m'' and the number of coprime integers below it. That is, ''m'' − φ(''m'') = ''n'', where Ï ...
.
122 is a
semiprime
In mathematics, a semiprime is a natural number that is the product of exactly two prime numbers. The two primes in the product may equal each other, so the semiprimes include the squares of prime numbers.
Because there are infinitely many prime ...
.
122 is the sum of squares of the divisors of 11.
φ(122) = φ(σ(122)).
In telephony
* The fire
emergency telephone number
Most public switched telephone networks have a single emergency telephone number (sometimes known as the universal emergency telephone number or the emergency services number) that allows a caller to contact local emergency services for assis ...
in
Austria
Austria, , bar, Östareich officially the Republic of Austria, is a country in the southern part of Central Europe, lying in the Eastern Alps. It is a federation of nine states, one of which is the capital, Vienna, the most populous ...
* The police
emergency telephone number
Most public switched telephone networks have a single emergency telephone number (sometimes known as the universal emergency telephone number or the emergency services number) that allows a caller to contact local emergency services for assis ...
in
Egypt
Egypt ( ar, مصر , ), officially the Arab Republic of Egypt, is a List of transcontinental countries, transcontinental country spanning the North Africa, northeast corner of Africa and Western Asia, southwest corner of Asia via a land bridg ...
* The traffic
emergency telephone number
Most public switched telephone networks have a single emergency telephone number (sometimes known as the universal emergency telephone number or the emergency services number) that allows a caller to contact local emergency services for assis ...
in
China
China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's List of countries and dependencies by population, most populous country, with a Population of China, population exceeding 1.4 billion, slig ...
* The police
emergency telephone number
Most public switched telephone networks have a single emergency telephone number (sometimes known as the universal emergency telephone number or the emergency services number) that allows a caller to contact local emergency services for assis ...
in
Bosnia and Herzegovina
Bosnia and Herzegovina ( sh, / , ), abbreviated BiH () or B&H, sometimes called Bosnia–Herzegovina and often known informally as Bosnia, is a country at the crossroads of south and southeast Europe, located in the Balkans. Bosnia and ...
In other fields
122 is also:
* The
atomic number
The atomic number or nuclear charge number (symbol ''Z'') of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei, this is equal to the proton number (''n''p) or the number of protons found in the nucleus of ever ...
of the
chemical element
A chemical element is a species of atoms that have a given number of protons in their atomic nucleus, nuclei, including the pure Chemical substance, substance consisting only of that species. Unlike chemical compounds, chemical elements canno ...
unbibium
* The number of men of
Michmas at the census (
Bible
The Bible (from Koine Greek , , 'the books') is a collection of religious texts or scriptures that are held to be sacred in Christianity
Christianity is an Abrahamic monotheistic religion based on the life and teachings of Jesus ...
,
Nehemiah
Nehemiah is the central figure of the Book of Nehemiah, which describes his work in rebuilding Jerusalem during the Second Temple period. He was governor of Persian Judea under Artaxerxes I of Persia (465–424 BC). The name is pronounced o ...
7:31)
* The Enroute Flight Advisory Service (EFAS) "
Flight Watch" frequency: 122.0 MHz
* The oldest age in years to which a human being has ever been authenticated to live (
Jeanne Calment
Jeanne Louise Calment (; 21 February 1875 – 4 August 1997) was a French supercentenarian and the oldest human whose age is documented, with a lifespan of 122 years and 164 days. Her longevity attracted media attention and medical studies o ...
).
See also
*
List of highways numbered 122
*
United Nations Security Council Resolution 122
References
{{DEFAULTSORT:122 (Number)
Integers