21652132564 has 48 divisors (see below), whose sum is σ = 40657857408. Its totient is φ = 10062949248.

The previous prime is 21652132529. The next prime is 21652132577. The reversal of 21652132564 is 46523125612.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3083922 + ... + 3090934.

It is an arithmetic number, because the mean of its divisors is an integer number (847038696).

Almost surely, 2^21652132564 is an apocalyptic number.

It is an amenable number.

21652132564 is a deficient number, since it is larger than the sum of its proper divisors (19005724844).

21652132564 is a wasteful number, since it uses less digits than its factorization.

21652132564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7984 (or 7982 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The spelling of 21652132564 in words is "twenty-one billion, six hundred fifty-two million, one hundred thirty-two thousand, five hundred sixty-four".