21588689664 has 108 divisors (see below), whose sum is σ = 64253646912. Its totient is φ = 6964070400.

The previous prime is 21588689659. The next prime is 21588689671. The reversal of 21588689664 is 46698688512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79707 + ... + 222554.

Almost surely, 2^21588689664 is an apocalyptic number.

21588689664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21588689664 is an abundant number, since it is smaller than the sum of its proper divisors (42664957248).

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

21588689664 is a wasteful number, since it uses less digits than its factorization.

21588689664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302314 (or 302297 counting only the distinct ones).

The product of its digits is 39813120, while the sum is 63.

The spelling of 21588689664 in words is "twenty-one billion, five hundred eighty-eight million, six hundred eighty-nine thousand, six hundred sixty-four".