21613499568 has 50 divisors (see below), whose sum is σ = 62555742084. Its totient is φ = 7204499424.

The previous prime is 21613499543. The next prime is 21613499573. The reversal of 21613499568 is 86599431612.

21613499568 is a `hidden beast` number, since 21 + 6 + 13 + 49 + 9 + 568 = 666.

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

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 9 ways as a sum of consecutive naturals, for example, 8337246 + ... + 8339837.

Almost surely, 2^21613499568 is an apocalyptic number.

It is an amenable number.

21613499568 is an abundant number, since it is smaller than the sum of its proper divisors (40942242516).

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

21613499568 is a wasteful number, since it uses less digits than its factorization.

21613499568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16677103 (or 16677088 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The spelling of 21613499568 in words is "twenty-one billion, six hundred thirteen million, four hundred ninety-nine thousand, five hundred sixty-eight".