21900631192 has 24 divisors (see below), whose sum is σ = 45136116900. Its totient is φ = 9954831920.

The previous prime is 21900631183. The next prime is 21900631213. The reversal of 21900631192 is 29113600912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11311342 + ... + 11313277.

Almost surely, 2^21900631192 is an apocalyptic number.

21900631192 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21900631192 is an abundant number, since it is smaller than the sum of its proper divisors (23235485708).

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

21900631192 is a wasteful number, since it uses less digits than its factorization.

21900631192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22624647 (or 22624632 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The spelling of 21900631192 in words is "twenty-one billion, nine hundred million, six hundred thirty-one thousand, one hundred ninety-two".