21528344360564 has 24 divisors (see below), whose sum is σ = 38477844236160. Its totient is φ = 10534694273216.

The previous prime is 21528344360563. The next prime is 21528344360591. The reversal of 21528344360564 is 46506344382512.

It is a super-2 number, since 2×21528344360564² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21528344360563) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1943279 + ... + 6843465.

It is an arithmetic number, because the mean of its divisors is an integer number (1603243509840).

Almost surely, 2^{21528344360564} is an apocalyptic number.

It is an amenable number.

21528344360564 is a deficient number, since it is larger than the sum of its proper divisors (16949499875596).

21528344360564 is a wasteful number, since it uses less digits than its factorization.

21528344360564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4923607 (or 4923605 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 53.

The spelling of 21528344360564 in words is "twenty-one trillion, five hundred twenty-eight billion, three hundred forty-four million, three hundred sixty thousand, five hundred sixty-four".