21792474172 has 12 divisors (see below), whose sum is σ = 43584948400. Its totient is φ = 9339631776.

The previous prime is 21792474169. The next prime is 21792474173. The reversal of 21792474172 is 27147429712.

21792474172 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21792474173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389151297 + ... + 389151352.

Almost surely, 2^21792474172 is an apocalyptic number.

It is an amenable number.

21792474172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21792474172 is a wasteful number, since it uses less digits than its factorization.

21792474172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778302660 (or 778302658 counting only the distinct ones).

The product of its digits is 395136, while the sum is 46.

The spelling of 21792474172 in words is "twenty-one billion, seven hundred ninety-two million, four hundred seventy-four thousand, one hundred seventy-two".