21250831200 has 144 divisors (see below), whose sum is σ = 72812214720. Its totient is φ = 5368619520.

The previous prime is 21250831183. The next prime is 21250831247. The reversal of 21250831200 is 213805212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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, 187414 + ... + 278613.

It is an arithmetic number, because the mean of its divisors is an integer number (505640380).

Almost surely, 2^21250831200 is an apocalyptic number.

21250831200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21250831200 is an abundant number, since it is smaller than the sum of its proper divisors (51561383520).

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

21250831200 is a wasteful number, since it uses less digits than its factorization.

21250831200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466069 (or 466056 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The spelling of 21250831200 in words is "twenty-one billion, two hundred fifty million, eight hundred thirty-one thousand, two hundred".