21224945904 has 60 divisors (see below), whose sum is σ = 57868892136. Its totient is φ = 6702609024.

The previous prime is 21224945857. The next prime is 21224945939. The reversal of 21224945904 is 40954942212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 595119 + ... + 629774.

Almost surely, 2^21224945904 is an apocalyptic number.

21224945904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21224945904 is an abundant number, since it is smaller than the sum of its proper divisors (36643946232).

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

21224945904 is a wasteful number, since it uses less digits than its factorization.

21224945904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224942 (or 1224917 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 21224945904 in words is "twenty-one billion, two hundred twenty-four million, nine hundred forty-five thousand, nine hundred four".