21663024325564 has 12 divisors (see below), whose sum is σ = 37939034271600. Its totient is φ = 10823300247968.

The previous prime is 21663024325531. The next prime is 21663024325717. The reversal of 21663024325564 is 46552342036612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2052972769 + ... + 2052983320.

It is an arithmetic number, because the mean of its divisors is an integer number (3161586189300).

Almost surely, 2^{21663024325564} is an apocalyptic number.

It is an amenable number.

21663024325564 is a deficient number, since it is larger than the sum of its proper divisors (16276009946036).

21663024325564 is a wasteful number, since it uses less digits than its factorization.

21663024325564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105957412 (or 4105957410 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 49.

The spelling of 21663024325564 in words is "twenty-one trillion, six hundred sixty-three billion, twenty-four million, three hundred twenty-five thousand, five hundred sixty-four".