57813021 has 20 divisors (see below), whose sum is σ = 98701152. Its totient is φ = 33035688.

The previous prime is 57813017. The next prime is 57813023. The reversal of 57813021 is 12031875.

It is not a de Polignac number, because 57813021 - 2² = 57813017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57813023) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 50415 + ... + 51548.

Almost surely, 2^57813021 is an apocalyptic number.

It is an amenable number.

57813021 is a deficient number, since it is larger than the sum of its proper divisors (40888131).

57813021 is a wasteful number, since it uses less digits than its factorization.

57813021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101982 (or 101973 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 57813021 is about 7603.4874235445. The cubic root of 57813021 is about 386.6712549825.

Adding to 57813021 its reverse (12031875), we get a palindrome (69844896).

The spelling of 57813021 in words is "fifty-seven million, eight hundred thirteen thousand, twenty-one".