21675432764 has 18 divisors (see below), whose sum is σ = 39285117144. Its totient is φ = 10464000400.

The previous prime is 21675432739. The next prime is 21675432799. The reversal of 21675432764 is 46723457612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3218312 + ... + 3225039.

It is an arithmetic number, because the mean of its divisors is an integer number (2182506508).

Almost surely, 2^21675432764 is an apocalyptic number.

It is an amenable number.

21675432764 is a deficient number, since it is larger than the sum of its proper divisors (17609684380).

21675432764 is a wasteful number, since it uses less digits than its factorization.

21675432764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6443413 (or 6443382 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 47.

The spelling of 21675432764 in words is "twenty-one billion, six hundred seventy-five million, four hundred thirty-two thousand, seven hundred sixty-four".