21037927688 has 36 divisors (see below), whose sum is σ = 41646925215. Its totient is φ = 9961641936.

The previous prime is 21037927657. The next prime is 21037927727. The reversal of 21037927688 is 88672973012.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 10518963844 + 10518963844 = 102562^2 + 102562^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=102562.

It is a Duffinian 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 8 ways as a sum of consecutive naturals, for example, 7793363 + ... + 7796061.

Almost surely, 2^21037927688 is an apocalyptic number.

It is an amenable number.

21037927688 is a deficient number, since it is larger than the sum of its proper divisors (20608997527).

21037927688 is an frugal number, since it uses more digits than its factorization.

21037927688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5442 (or 2720 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 21037927688 in words is "twenty-one billion, thirty-seven million, nine hundred twenty-seven thousand, six hundred eighty-eight".