53188821 has 24 divisors (see below), whose sum is σ = 89121344. Its totient is φ = 29937600.

The previous prime is 53188789. The next prime is 53188823. The reversal of 53188821 is 12888135.

It is not a de Polignac number, because 53188821 - 2⁵ = 53188789 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53188823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2080 + ... + 10521.

Almost surely, 2^53188821 is an apocalyptic number.

It is an amenable number.

53188821 is a deficient number, since it is larger than the sum of its proper divisors (35932523).

53188821 is a wasteful number, since it uses less digits than its factorization.

53188821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12681 (or 12678 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 53188821 is about 7293.0666389387. The cubic root of 53188821 is about 376.0741257395.

The spelling of 53188821 in words is "fifty-three million, one hundred eighty-eight thousand, eight hundred twenty-one".