21616360553204 has 24 divisors (see below), whose sum is σ = 37857942051720. Its totient is φ = 10799806685184.

The previous prime is 21616360553153. The next prime is 21616360553213. The reversal of 21616360553204 is 40235506361612.

It can be written as a sum of positive squares in 4 ways, for example, as 1793403072400 + 19822957480804 = 1339180^2 + 4452298^2 .

It is a super-2 number, since 2×21616360553204² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92612552 + ... + 92845664.

It is an arithmetic number, because the mean of its divisors is an integer number (1577414252155).

Almost surely, 2^{21616360553204} is an apocalyptic number.

It is an amenable number.

21616360553204 is a deficient number, since it is larger than the sum of its proper divisors (16241581498516).

21616360553204 is a wasteful number, since it uses less digits than its factorization.

21616360553204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250979 (or 250977 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 21616360553204 in words is "twenty-one trillion, six hundred sixteen billion, three hundred sixty million, five hundred fifty-three thousand, two hundred four".