21108965800 has 96 divisors (see below), whose sum is σ = 55635501600. Its totient is φ = 7383847680.

The previous prime is 21108965747. The next prime is 21108965827. The reversal of 21108965800 is 856980112.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164254 + ... + 263053.

It is an arithmetic number, because the mean of its divisors is an integer number (579536475).

Almost surely, 2^21108965800 is an apocalyptic number.

21108965800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21108965800 is an abundant number, since it is smaller than the sum of its proper divisors (34526535800).

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

21108965800 is a wasteful number, since it uses less digits than its factorization.

21108965800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427355 (or 427346 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 40.

The spelling of 21108965800 in words is "twenty-one billion, one hundred eight million, nine hundred sixty-five thousand, eight hundred".