21379021632 has 112 divisors (see below), whose sum is σ = 64383513600. Its totient is φ = 6952504320.

The previous prime is 21379021621. The next prime is 21379021639. The reversal of 21379021632 is 23612097312.

21379021632 is a `hidden beast` number, since 2 + 13 + 7 + 9 + 0 + 2 + 1 + 632 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21379021639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80032 + ... + 221727.

It is an arithmetic number, because the mean of its divisors is an integer number (574852800).

Almost surely, 2^21379021632 is an apocalyptic number.

It is an amenable number.

21379021632 is an abundant number, since it is smaller than the sum of its proper divisors (43004491968).

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

21379021632 is a wasteful number, since it uses less digits than its factorization.

21379021632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301821 (or 301805 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The spelling of 21379021632 in words is "twenty-one billion, three hundred seventy-nine million, twenty-one thousand, six hundred thirty-two".