21198932512 has 48 divisors (see below), whose sum is σ = 42207563160. Its totient is φ = 10479771648.

The previous prime is 21198932497. The next prime is 21198932543. The reversal of 21198932512 is 21523989112.

It can be written as a sum of positive squares in 4 ways, for example, as 20450144016 + 748788496 = 143004^2 + 27364^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3812038 + ... + 3817594.

Almost surely, 2^21198932512 is an apocalyptic number.

It is an amenable number.

21198932512 is a deficient number, since it is larger than the sum of its proper divisors (21008630648).

21198932512 is a wasteful number, since it uses less digits than its factorization.

21198932512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6893 (or 6885 counting only the distinct ones).

The product of its digits is 77760, while the sum is 43.

It can be divided in two parts, 2 and 1198932512, that multiplied together give a square (2397865024 = 48968²).

The spelling of 21198932512 in words is "twenty-one billion, one hundred ninety-eight million, nine hundred thirty-two thousand, five hundred twelve".