21922117928 has 32 divisors (see below), whose sum is σ = 42125714400. Its totient is φ = 10689392448.

The previous prime is 21922117909. The next prime is 21922117957. The reversal of 21922117928 is 82971122912.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171638 + ... + 270746.

It is an arithmetic number, because the mean of its divisors is an integer number (1316428575).

Almost surely, 2^21922117928 is an apocalyptic number.

It is an amenable number.

21922117928 is a deficient number, since it is larger than the sum of its proper divisors (20203596472).

21922117928 is a wasteful number, since it uses less digits than its factorization.

21922117928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99801 (or 99797 counting only the distinct ones).

The product of its digits is 72576, while the sum is 44.

The spelling of 21922117928 in words is "twenty-one billion, nine hundred twenty-two million, one hundred seventeen thousand, nine hundred twenty-eight".