121857568 has 24 divisors (see below), whose sum is σ = 274180032. Its totient is φ = 52224576.

The previous prime is 121857551. The next prime is 121857569. The reversal of 121857568 is 865758121.

It is not an unprimeable number, because it can be changed into a prime (121857569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271780 + ... + 272227.

It is an arithmetic number, because the mean of its divisors is an integer number (11424168).

Almost surely, 2^121857568 is an apocalyptic number.

It is an amenable number.

121857568 is an abundant number, since it is smaller than the sum of its proper divisors (152322464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121857568 is an equidigital number, since it uses as much as digits as its factorization.

121857568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544024 (or 544016 counting only the distinct ones).

The product of its digits is 134400, while the sum is 43.

The square root of 121857568 is about 11038.9115405460. The cubic root of 121857568 is about 495.7744812447.

The spelling of 121857568 in words is "one hundred twenty-one million, eight hundred fifty-seven thousand, five hundred sixty-eight".