21672071724 has 48 divisors (see below), whose sum is σ = 53993947392. Its totient is φ = 6749236032.

The previous prime is 21672071713. The next prime is 21672071731. The reversal of 21672071724 is 42717027612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 901179 + ... + 924914.

It is an arithmetic number, because the mean of its divisors is an integer number (1124873904).

Almost surely, 2^21672071724 is an apocalyptic number.

It is an amenable number.

21672071724 is an abundant number, since it is smaller than the sum of its proper divisors (32321875668).

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

21672071724 is a wasteful number, since it uses less digits than its factorization.

21672071724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826166 (or 1826164 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 39.

The spelling of 21672071724 in words is "twenty-one billion, six hundred seventy-two million, seventy-one thousand, seven hundred twenty-four".