122 (number)

Short description: Natural number

← 121 122 123 →
← 120 121 122 123 124 125 126 127 128 129 → List of numbers — Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred twenty-two
Ordinal	122nd (one hundred twenty-second)
Factorization	2 × 61
Divisors	1, 2, 61, 122
Greek numeral	ΡΚΒ´
Roman numeral	CXXII
Binary	11110102
Ternary	111123
Quaternary	13224
Quinary	4425
Senary	3226
Octal	1728
Duodecimal	A212
Hexadecimal	7A16
Vigesimal	6220
Base 36	3E36

122 (one hundred [and] twenty-two) is the natural number following 121 and preceding 123.

In mathematics

122 is a nontotient since there is no integer with exactly 122 coprimes below it. Nor is there an integer with exactly 122 integers with common factors below it, making 122 a noncototient.

122 is a semiprime.

122 is the sum of squares of the divisors of 11.

φ(122) = φ(σ(122)).

In other fields

• The atomic number of the chemical element unbibium
• The emergency telephone number in several countries
• The number of men of Michmas at the census (Bible, Nehemiah 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).

See also

• List of highways numbered 122
• United Nations Security Council Resolution 122