21188792608 has 12 divisors (see below), whose sum is σ = 41715435510. Its totient is φ = 10594396288.

The previous prime is 21188792591. The next prime is 21188792633. The reversal of 21188792608 is 80629788112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12631062544 + 8557730064 = 112388^2 + 92508^2 .

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 331074853 + ... + 331074916.

Almost surely, 2^21188792608 is an apocalyptic number.

It is an amenable number.

21188792608 is a deficient number, since it is larger than the sum of its proper divisors (20526642902).

21188792608 is an equidigital number, since it uses as much as digits as its factorization.

21188792608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662149779 (or 662149771 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 52.

The spelling of 21188792608 in words is "twenty-one billion, one hundred eighty-eight million, seven hundred ninety-two thousand, six hundred eight".