21311376769944 has 96 divisors (see below), whose sum is σ = 61146247003920. Its totient is φ = 6682340302848.

The previous prime is 21311376769877. The next prime is 21311376769981. The reversal of 21311376769944 is 44996767311312.

21311376769944 is a `hidden beast` number, since 2 + 131 + 1 + 376 + 7 + 6 + 99 + 44 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2377689 + ... + 6948104.

Almost surely, 2^{21311376769944} is an apocalyptic number.

21311376769944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21311376769944 is an abundant number, since it is smaller than the sum of its proper divisors (39834870233976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21311376769944 is a wasteful number, since it uses less digits than its factorization.

21311376769944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9327689 (or 9327682 counting only the distinct ones).

The product of its digits is 41150592, while the sum is 63.

The spelling of 21311376769944 in words is "twenty-one trillion, three hundred eleven billion, three hundred seventy-six million, seven hundred sixty-nine thousand, nine hundred forty-four".