21764716264 has 32 divisors (see below), whose sum is σ = 41881356000. Its totient is φ = 10599740352.

The previous prime is 21764716199. The next prime is 21764716283. The reversal of 21764716264 is 46261746712.

It is a super-2 number, since 2×21764716264² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160074 + ... + 262969.

It is an arithmetic number, because the mean of its divisors is an integer number (1308792375).

Almost surely, 2^21764716264 is an apocalyptic number.

It is an amenable number.

21764716264 is a deficient number, since it is larger than the sum of its proper divisors (20116639736).

21764716264 is a wasteful number, since it uses less digits than its factorization.

21764716264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423217 (or 423213 counting only the distinct ones).

The product of its digits is 677376, while the sum is 46.

The spelling of 21764716264 in words is "twenty-one billion, seven hundred sixty-four million, seven hundred sixteen thousand, two hundred sixty-four".