21937799616 has 56 divisors (see below), whose sum is σ = 58269743760. Its totient is φ = 7284129792.

The previous prime is 21937799581. The next prime is 21937799629. The reversal of 21937799616 is 61699773912.

It is a self number, because there is not a number n which added to its sum of digits gives 21937799616.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172951 + ... + 271638.

Almost surely, 2^21937799616 is an apocalyptic number.

It is an amenable number.

21937799616 is an abundant number, since it is smaller than the sum of its proper divisors (36331944144).

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

21937799616 is a wasteful number, since it uses less digits than its factorization.

21937799616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444861 (or 444851 counting only the distinct ones).

The product of its digits is 7715736, while the sum is 60.

The spelling of 21937799616 in words is "twenty-one billion, nine hundred thirty-seven million, seven hundred ninety-nine thousand, six hundred sixteen".