21691185592 has 16 divisors (see below), whose sum is σ = 40740267960. Its totient is φ = 10827114144.

The previous prime is 21691185563. The next prime is 21691185629. The reversal of 21691185592 is 29558119612.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 2304843 + ... + 2314234.

Almost surely, 2^21691185592 is an apocalyptic number.

It is an amenable number.

21691185592 is a deficient number, since it is larger than the sum of its proper divisors (19049082368).

21691185592 is a wasteful number, since it uses less digits than its factorization.

21691185592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4619670 (or 4619666 counting only the distinct ones).

The product of its digits is 388800, while the sum is 49.

The spelling of 21691185592 in words is "twenty-one billion, six hundred ninety-one million, one hundred eighty-five thousand, five hundred ninety-two".