121021955 has 16 divisors (see below), whose sum is σ = 150825024. Its totient is φ = 93150720.

The previous prime is 121021939. The next prime is 121021969. The reversal of 121021955 is 559120121.

It is not a de Polignac number, because 121021955 - 2⁴ = 121021939 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10922 + ... + 19008.

It is an arithmetic number, because the mean of its divisors is an integer number (9426564).

Almost surely, 2^121021955 is an apocalyptic number.

121021955 is a deficient number, since it is larger than the sum of its proper divisors (29803069).

121021955 is an equidigital number, since it uses as much as digits as its factorization.

121021955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8206.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 121021955 is about 11000.9979092808. The cubic root of 121021955 is about 494.6386574881.

The spelling of 121021955 in words is "one hundred twenty-one million, twenty-one thousand, nine hundred fifty-five".