21903900872 has 64 divisors (see below), whose sum is σ = 50032896000. Its totient is φ = 8780705856.

The previous prime is 21903900859. The next prime is 21903900911. The reversal of 21903900872 is 27800930912.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46238 + ... + 214349.

It is an arithmetic number, because the mean of its divisors is an integer number (781764000).

Almost surely, 2^21903900872 is an apocalyptic number.

It is an amenable number.

21903900872 is an abundant number, since it is smaller than the sum of its proper divisors (28128995128).

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

21903900872 is a wasteful number, since it uses less digits than its factorization.

21903900872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260698 (or 260694 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 21903900872 in words is "twenty-one billion, nine hundred three million, nine hundred thousand, eight hundred seventy-two".