21642551162504 has 32 divisors (see below), whose sum is σ = 40711295701440. Its totient is φ = 10786207406400.

The previous prime is 21642551162473. The next prime is 21642551162509. The reversal of 21642551162504 is 40526115524612.

It is not an unprimeable number, because it can be changed into a prime (21642551162509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128249207 + ... + 128417849.

It is an arithmetic number, because the mean of its divisors is an integer number (1272227990670).

Almost surely, 2^{21642551162504} is an apocalyptic number.

It is an amenable number.

21642551162504 is a deficient number, since it is larger than the sum of its proper divisors (19068744538936).

21642551162504 is a wasteful number, since it uses less digits than its factorization.

21642551162504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220541 (or 220537 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 44.

The spelling of 21642551162504 in words is "twenty-one trillion, six hundred forty-two billion, five hundred fifty-one million, one hundred sixty-two thousand, five hundred four".