21100004508 has 24 divisors (see below), whose sum is σ = 53709102720. Its totient is φ = 6393940720.

The previous prime is 21100004483. The next prime is 21100004543. The reversal of 21100004508 is 80540000112.

It is a congruent number.

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, 79924128 + ... + 79924391.

It is an arithmetic number, because the mean of its divisors is an integer number (2237879280).

Almost surely, 2^21100004508 is an apocalyptic number.

It is an amenable number.

21100004508 is an abundant number, since it is smaller than the sum of its proper divisors (32609098212).

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

21100004508 is a wasteful number, since it uses less digits than its factorization.

21100004508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159848537 (or 159848535 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The spelling of 21100004508 in words is "twenty-one billion, one hundred million, four thousand, five hundred eight".