21164642204 has 24 divisors (see below), whose sum is σ = 37261889280. Its totient is φ = 10518492096.

The previous prime is 21164642173. The next prime is 21164642231. The reversal of 21164642204 is 40224646112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 844202 + ... + 868910.

It is an arithmetic number, because the mean of its divisors is an integer number (1552578720).

Almost surely, 2^21164642204 is an apocalyptic number.

It is an amenable number.

21164642204 is a deficient number, since it is larger than the sum of its proper divisors (16097247076).

21164642204 is a wasteful number, since it uses less digits than its factorization.

21164642204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25997 (or 25995 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The spelling of 21164642204 in words is "twenty-one billion, one hundred sixty-four million, six hundred forty-two thousand, two hundred four".