21197834800 has 60 divisors (see below), whose sum is σ = 51541466760. Its totient is φ = 8376962560.

The previous prime is 21197834797. The next prime is 21197834857. The reversal of 21197834800 is 843879112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 286045 + ... + 352444.

It is an arithmetic number, because the mean of its divisors is an integer number (859024446).

Almost surely, 2^21197834800 is an apocalyptic number.

21197834800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21197834800 is an abundant number, since it is smaller than the sum of its proper divisors (30343631960).

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

21197834800 is a wasteful number, since it uses less digits than its factorization.

21197834800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638590 (or 638579 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 21197834800 in words is "twenty-one billion, one hundred ninety-seven million, eight hundred thirty-four thousand, eight hundred".