Main Page | See live article | Alphabetical index

One hundred twenty

One hundred twenty (in American English; written and spoken as One hundred and twenty in British English and other english forms) (120, CXX) is the natural number following one hundred nineteen and preceding one hundred twenty-one. It is a triangular number as well as a composite number, with its divisors being 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 25, 30 and 60, making it a highly composite number, and its factorization is

This number is also the sum of a twin prime (59 + 61) as well as the sum of four consecutive primes (23 + 29 + 31 + 37). 120 is the smallest number to appear six times in Pascal's triangle. Five factorial is equal to 120.

See also: one hundred, one hundred ten, one hundred twenty, one hundred thirty

One hundred twenty is also:

This article is about the number. For the year AD 120, see 120.


One hundred twenty-one (121, CXXI) is the natural number following one hundred twenty and preceding one hundred twenty-two. It is a composite number, and its factorization is

This number is the sum of three consecutive primes (37 + 41 + 43).

One hundred twenty-one is also:

This article is about the number. For the year AD 121, see 121.


One hundred twenty-two (122, CXXII) is the natural number following one hundred twenty-one and preceding one hundred twenty-three. It is a composite number, and its factorization is

One hundred twenty-two is also:

This article is about the number. For the year AD 122, see 122.


One hundred twenty-three (123, CXXIII) is the natural number following one hundred twenty-two and preceding one hundred twenty-four. It is a Lucas number and a composite number, and its factorization is

One hundred twenty-three is also:

This article is about the number. For the year AD 123, see 123.


One hundred twenty-four (124, CXXIV) is the natural number following one hundred twenty-three and preceding one hundred twenty-five. It is a composite number, and its factorization is

One hundred twenty-four is also:

This article is about the number. For the year AD 124, see 124.


One hundred twenty-five (125, CXXV) is the natural number following one hundred twenty-four and preceding one hundred twenty-six. It is a composite number, and its factorization is

One hundred twenty-five is also:

This article is about the number. For the year AD 125, see 125.


One hundred twenty-six (126, CXXVI) is the natural number following one hundred twenty-five and preceding one hundred twenty-six. It is a composite number, with divsisors 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, making it an abundant number, and its factorization is

One hundred twenty-six is also:

This article is about the number. For the year AD 126, see 126.


One hundred twenty-seven (127, CXXVII) is the natural number following one hundred twenty-six and preceding one hundred twenty-eight. It is a Mersenne prime, 27 - 1, and as such, in binary it is a repunit prime, a permutable prime and a palindromic prime. This also means it is the largest integer that can be represented by a signed byte.

One hundred twenty-seven is also:

This article is about the number. For the year AD 127, see 127.


One hundred twenty-eight (128, CXXVIII) is the natural number following one hundred twenty-seven and preceding one hundred twenty-eight. It is a composite number, and its factorization is

One hundred twenty-eight is also:

This article is about the number. For the year AD 128, see 128.


One hundred twenty-nine (129, CXXIX) is the natural number following one hundred twenty-eight and preceding one hundred thirty. It is a composite number, and its factorization is

This number is the sum of the first ten prime numbers.

One hundred twenty-nine is also:

This article is about the number. For the year AD 129, see 129.