21312400204 has 12 divisors (see below), whose sum is σ = 37534260064. Its totient is φ = 10588325904.

The previous prime is 21312400189. The next prime is 21312400247. The reversal of 21312400204 is 40200421312.

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, 16967844 + ... + 16969099.

Almost surely, 2^21312400204 is an apocalyptic number.

It is an amenable number.

21312400204 is a deficient number, since it is larger than the sum of its proper divisors (16221859860).

21312400204 is a wasteful number, since it uses less digits than its factorization.

21312400204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33937104 (or 33937102 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21312400204 its reverse (40200421312), we get a palindrome (61512821516).

The spelling of 21312400204 in words is "twenty-one billion, three hundred twelve million, four hundred thousand, two hundred four".