21926790928 has 40 divisors (see below), whose sum is σ = 50663150208. Its totient is φ = 8988621312.

The previous prime is 21926790877. The next prime is 21926790937. The reversal of 21926790928 is 82909762912.

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, 4253401 + ... + 4258552.

Almost surely, 2^21926790928 is an apocalyptic number.

21926790928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21926790928 is an abundant number, since it is smaller than the sum of its proper divisors (28736359280).

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

21926790928 is a wasteful number, since it uses less digits than its factorization.

21926790928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8511991 (or 8511985 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 21926790928 in words is "twenty-one billion, nine hundred twenty-six million, seven hundred ninety thousand, nine hundred twenty-eight".