21939423588 has 24 divisors (see below), whose sum is σ = 56879987360. Its totient is φ = 7313141160.

The previous prime is 21939423581. The next prime is 21939423589. The reversal of 21939423588 is 88532493912.

21939423588 is a `hidden beast` number, since 2 + 1 + 9 + 39 + 4 + 23 + 588 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (21939423581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101571298 + ... + 101571513.

Almost surely, 2^21939423588 is an apocalyptic number.

It is an amenable number.

21939423588 is an abundant number, since it is smaller than the sum of its proper divisors (34940563772).

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

21939423588 is a wasteful number, since it uses less digits than its factorization.

21939423588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203142824 (or 203142816 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The spelling of 21939423588 in words is "twenty-one billion, nine hundred thirty-nine million, four hundred twenty-three thousand, five hundred eighty-eight".