21563842795392 has 64 divisors (see below), whose sum is σ = 59254093918800. Its totient is φ = 6940087332864.

The previous prime is 21563842795387. The next prime is 21563842795433. The reversal of 21563842795392 is 29359724836512.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×21563842795392² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 968193013 + ... + 968215284.

Almost surely, 2^{21563842795392} is an apocalyptic number.

It is an amenable number.

21563842795392 is an abundant number, since it is smaller than the sum of its proper divisors (37690251123408).

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

21563842795392 is a wasteful number, since it uses less digits than its factorization.

21563842795392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936408343 (or 1936408331 counting only the distinct ones).

The product of its digits is 195955200, while the sum is 66.

The spelling of 21563842795392 in words is "twenty-one trillion, five hundred sixty-three billion, eight hundred forty-two million, seven hundred ninety-five thousand, three hundred ninety-two".