21917423583 has 32 divisors (see below), whose sum is σ = 36643564800. Its totient is φ = 12825237600.

The previous prime is 21917423573. The next prime is 21917423599. The reversal of 21917423583 is 38532471912.

It is a happy number.

21917423583 is a `hidden beast` number, since 2 + 19 + 17 + 42 + 3 + 583 = 666.

It is not a de Polignac number, because 21917423583 - 2⁵ = 21917423551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21917423543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1263733 + ... + 1280958.

It is an arithmetic number, because the mean of its divisors is an integer number (1145111400).

Almost surely, 2^21917423583 is an apocalyptic number.

21917423583 is a deficient number, since it is larger than the sum of its proper divisors (14726141217).

21917423583 is a wasteful number, since it uses less digits than its factorization.

21917423583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544740 (or 2544734 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 21917423583 in words is "twenty-one billion, nine hundred seventeen million, four hundred twenty-three thousand, five hundred eighty-three".