21979932929584 has 160 divisors (see below), whose sum is σ = 53779081061376. Its totient is φ = 8479477923840.

The previous prime is 21979932929527. The next prime is 21979932929597. The reversal of 21979932929584 is 48592923997912.

It is a super-2 number, since 2×21979932929584² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 529731079 + ... + 529772569.

Almost surely, 2^{21979932929584} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21979932929584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26889540530688).

21979932929584 is an abundant number, since it is smaller than the sum of its proper divisors (31799148131792).

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

21979932929584 is a wasteful number, since it uses less digits than its factorization.

21979932929584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53643 (or 53637 counting only the distinct ones).

The product of its digits is 1587237120, while the sum is 79.

The spelling of 21979932929584 in words is "twenty-one trillion, nine hundred seventy-nine billion, nine hundred thirty-two million, nine hundred twenty-nine thousand, five hundred eighty-four".