21723593424 has 80 divisors (see below), whose sum is σ = 60471671232. Its totient is φ = 6680254464.

The previous prime is 21723593417. The next prime is 21723593471. The reversal of 21723593424 is 42439532712.

It is a super-2 number, since 2×21723593424² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 1159459 + ... + 1178045.

Almost surely, 2^21723593424 is an apocalyptic number.

21723593424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21723593424 is an abundant number, since it is smaller than the sum of its proper divisors (38748077808).

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

21723593424 is a wasteful number, since it uses less digits than its factorization.

21723593424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20484 (or 20478 counting only the distinct ones).

The product of its digits is 362880, while the sum is 42.

The spelling of 21723593424 in words is "twenty-one billion, seven hundred twenty-three million, five hundred ninety-three thousand, four hundred twenty-four".