57317821 has 12 divisors (see below), whose sum is σ = 63248416. Its totient is φ = 51903720.

The previous prime is 57317801. The next prime is 57317831. The reversal of 57317821 is 12871375.

It is not a de Polignac number, because 57317821 - 2⁵ = 57317789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57317801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36376 + ... + 37918.

Almost surely, 2^57317821 is an apocalyptic number.

It is an amenable number.

57317821 is a deficient number, since it is larger than the sum of its proper divisors (5930595).

57317821 is a wasteful number, since it uses less digits than its factorization.

57317821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872 (or 1861 counting only the distinct ones).

The product of its digits is 11760, while the sum is 34.

The square root of 57317821 is about 7570.8533865080. The cubic root of 57317821 is about 385.5640711238.

The spelling of 57317821 in words is "fifty-seven million, three hundred seventeen thousand, eight hundred twenty-one".