21371730396 has 72 divisors (see below), whose sum is σ = 51790133136. Its totient is φ = 6857518080.

The previous prime is 21371730371. The next prime is 21371730439. The reversal of 21371730396 is 69303717312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1610380 + ... + 1623596.

Almost surely, 2^21371730396 is an apocalyptic number.

It is an amenable number.

21371730396 is an abundant number, since it is smaller than the sum of its proper divisors (30418402740).

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

21371730396 is a wasteful number, since it uses less digits than its factorization.

21371730396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13379 (or 13330 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 42.

The spelling of 21371730396 in words is "twenty-one billion, three hundred seventy-one million, seven hundred thirty thousand, three hundred ninety-six".