21710764944 has 60 divisors (see below), whose sum is σ = 66283628112. Its totient is φ = 6579019200.

The previous prime is 21710764927. The next prime is 21710764981. The reversal of 21710764944 is 44946701712.

21710764944 is a `hidden beast` number, since 21 + 71 + 0 + 76 + 494 + 4 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21710764944.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6851562 + ... + 6854729.

Almost surely, 2^21710764944 is an apocalyptic number.

21710764944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21710764944 is an abundant number, since it is smaller than the sum of its proper divisors (44572863168).

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

21710764944 is a wasteful number, since it uses less digits than its factorization.

21710764944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13706316 (or 13706307 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 21710764944 in words is "twenty-one billion, seven hundred ten million, seven hundred sixty-four thousand, nine hundred forty-four".