120921857 has 24 divisors (see below), whose sum is σ = 144515520. Its totient is φ = 100850400.

The previous prime is 120921821. The next prime is 120921881. The reversal of 120921857 is 758129021.

It is not a de Polignac number, because 120921857 - 2⁸ = 120921601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120921457) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 436403 + ... + 436679.

It is an arithmetic number, because the mean of its divisors is an integer number (6021480).

Almost surely, 2^120921857 is an apocalyptic number.

It is an amenable number.

120921857 is a deficient number, since it is larger than the sum of its proper divisors (23593663).

120921857 is a wasteful number, since it uses less digits than its factorization.

120921857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 120921857 is about 10996.4474717974. The cubic root of 120921857 is about 494.5022469851.

The spelling of 120921857 in words is "one hundred twenty million, nine hundred twenty-one thousand, eight hundred fifty-seven".