21664034204 has 12 divisors (see below), whose sum is σ = 37914421104. Its totient is φ = 10831342464.

The previous prime is 21664034191. The next prime is 21664034237. The reversal of 21664034204 is 40243046612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92597 + ... + 227820.

It is an arithmetic number, because the mean of its divisors is an integer number (3159535092).

Almost surely, 2^21664034204 is an apocalyptic number.

It is an amenable number.

21664034204 is a deficient number, since it is larger than the sum of its proper divisors (16250386900).

21664034204 is a wasteful number, since it uses less digits than its factorization.

21664034204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337324 (or 337322 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The spelling of 21664034204 in words is "twenty-one billion, six hundred sixty-four million, thirty-four thousand, two hundred four".