21655044202564 has 24 divisors (see below), whose sum is σ = 40032831333600. Its totient is φ = 10221148405440.

The previous prime is 21655044202523. The next prime is 21655044202643. The reversal of 21655044202564 is 46520244055612.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506980054 + ... + 507022765.

It is an arithmetic number, because the mean of its divisors is an integer number (1668034638900).

Almost surely, 2^{21655044202564} is an apocalyptic number.

It is an amenable number.

21655044202564 is a deficient number, since it is larger than the sum of its proper divisors (18377787131036).

21655044202564 is a wasteful number, since it uses less digits than its factorization.

21655044202564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014003123 (or 1014003121 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 46.

The spelling of 21655044202564 in words is "twenty-one trillion, six hundred fifty-five billion, forty-four million, two hundred two thousand, five hundred sixty-four".