57052821 has 16 divisors (see below), whose sum is σ = 87087744. Its totient is φ = 32545344.

The previous prime is 57052813. The next prime is 57052837. The reversal of 57052821 is 12825075.

It is not a de Polignac number, because 57052821 - 2³ = 57052813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57052841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12211 + ... + 16223.

It is an arithmetic number, because the mean of its divisors is an integer number (5442984).

Almost surely, 2^57052821 is an apocalyptic number.

It is an amenable number.

57052821 is a deficient number, since it is larger than the sum of its proper divisors (30034923).

57052821 is a wasteful number, since it uses less digits than its factorization.

57052821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4700.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 57052821 is about 7553.3317814061. The cubic root of 57052821 is about 384.9689546001.

Subtracting from 57052821 its product of nonzero digits (5600), we obtain a triangular number (57047221 = T₁₀₆₈₁).

Adding to 57052821 its reverse (12825075), we get a palindrome (69877896).

The spelling of 57052821 in words is "fifty-seven million, fifty-two thousand, eight hundred twenty-one".