21764720404 has 24 divisors (see below), whose sum is σ = 43556123520. Its totient is φ = 9322019616.

The previous prime is 21764720359. The next prime is 21764720447. The reversal of 21764720404 is 40402746712.

It is a congruent number.

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, 191584 + ... + 283255.

It is an arithmetic number, because the mean of its divisors is an integer number (1814838480).

Almost surely, 2^21764720404 is an apocalyptic number.

It is an amenable number.

21764720404 is an abundant number, since it is smaller than the sum of its proper divisors (21791403116).

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

21764720404 is a wasteful number, since it uses less digits than its factorization.

21764720404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476487 (or 476485 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 37.

The spelling of 21764720404 in words is "twenty-one billion, seven hundred sixty-four million, seven hundred twenty thousand, four hundred four".