21589524868 has 12 divisors (see below), whose sum is σ = 38299226140. Its totient is φ = 10646888832.

The previous prime is 21589524863. The next prime is 21589524911. The reversal of 21589524868 is 86842598512.

It can be written as a sum of positive squares in 2 ways, for example, as 14469202944 + 7120321924 = 120288^2 + 84382^2 .

It is a super-2 number, since 2×21589524868² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21589524863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36968073 + ... + 36968656.

Almost surely, 2^21589524868 is an apocalyptic number.

It is an amenable number.

21589524868 is a deficient number, since it is larger than the sum of its proper divisors (16709701272).

21589524868 is a wasteful number, since it uses less digits than its factorization.

21589524868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73936806 (or 73936804 counting only the distinct ones).

The product of its digits is 11059200, while the sum is 58.

The spelling of 21589524868 in words is "twenty-one billion, five hundred eighty-nine million, five hundred twenty-four thousand, eight hundred sixty-eight".