57012921 has 18 divisors (see below), whose sum is σ = 95797962. Its totient is φ = 32578560.

The previous prime is 57012899. The next prime is 57012941. The reversal of 57012921 is 12921075.

57012921 is a `hidden beast` number, since 570 + 1 + 2 + 92 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 56836521 + 176400 = 7539^2 + 420^2 .

It is not a de Polignac number, because 57012921 - 2⁵ = 57012889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57012941) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 64200 + ... + 65081.

It is an arithmetic number, because the mean of its divisors is an integer number (5322109).

Almost surely, 2^57012921 is an apocalyptic number.

It is an amenable number.

57012921 is a deficient number, since it is larger than the sum of its proper divisors (38785041).

57012921 is a wasteful number, since it uses less digits than its factorization.

57012921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129301 (or 129291 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 57012921 is about 7550.6901009113. The cubic root of 57012921 is about 384.8791907453.

Adding to 57012921 its reverse (12921075), we get a palindrome (69933996).

The spelling of 57012921 in words is "fifty-seven million, twelve thousand, nine hundred twenty-one".