21192083872 has 12 divisors (see below), whose sum is σ = 41721915186. Its totient is φ = 10596041920.

The previous prime is 21192083831. The next prime is 21192083893. The reversal of 21192083872 is 27838029112.

It can be written as a sum of positive squares in only one way, i.e., 15746234256 + 5445849616 = 125484^2 + 73796^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331126279 + ... + 331126342.

Almost surely, 2^21192083872 is an apocalyptic number.

It is an amenable number.

21192083872 is a deficient number, since it is larger than the sum of its proper divisors (20529831314).

21192083872 is an equidigital number, since it uses as much as digits as its factorization.

21192083872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662252631 (or 662252623 counting only the distinct ones).

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

The spelling of 21192083872 in words is "twenty-one billion, one hundred ninety-two million, eighty-three thousand, eight hundred seventy-two".