21917423584 has 48 divisors (see below), whose sum is σ = 50904999936. Its totient is φ = 9090172800.

The previous prime is 21917423573. The next prime is 21917423599. The reversal of 21917423584 is 48532471912.

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, 1571212 + ... + 1585099.

It is an arithmetic number, because the mean of its divisors is an integer number (1060520832).

Almost surely, 2^21917423584 is an apocalyptic number.

It is an amenable number.

21917423584 is an abundant number, since it is smaller than the sum of its proper divisors (28987576352).

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

21917423584 is a wasteful number, since it uses less digits than its factorization.

21917423584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3156359 (or 3156351 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The spelling of 21917423584 in words is "twenty-one billion, nine hundred seventeen million, four hundred twenty-three thousand, five hundred eighty-four".