21302656504 has 16 divisors (see below), whose sum is σ = 39983378400. Its totient is φ = 10640422272.

The previous prime is 21302656451. The next prime is 21302656513. The reversal of 21302656504 is 40565620312.

It is a self number, because there is not a number n which added to its sum of digits gives 21302656504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1354944 + ... + 1370575.

It is an arithmetic number, because the mean of its divisors is an integer number (2498961150).

Almost surely, 2^21302656504 is an apocalyptic number.

It is an amenable number.

21302656504 is a deficient number, since it is larger than the sum of its proper divisors (18680721896).

21302656504 is a wasteful number, since it uses less digits than its factorization.

21302656504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726502 (or 2726498 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 21302656504 in words is "twenty-one billion, three hundred two million, six hundred fifty-six thousand, five hundred four".