23688595921 has 3 divisors (see below), whose sum is σ = 23688749833. Its totient is φ = 23688442010.

The previous prime is 23688595907. The next prime is 23688595949. The reversal of 23688595921 is 12959588632.

The square root of 23688595921 is 153911.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 23688595921 - 2²⁵ = 23655041489 is a prime.

It is a super-2 number, since 2×23688595921² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23688595121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 76956 + ... + 230866.

Almost surely, 2^23688595921 is an apocalyptic number.

23688595921 is the 153911-st square number.

23688595921 is the 76956-th centered octagonal number.

It is an amenable number.

23688595921 is a deficient number, since it is larger than the sum of its proper divisors (153912).

23688595921 is an frugal number, since it uses more digits than its factorization.

23688595921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307822 (or 153911 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 58.

The spelling of 23688595921 in words is "twenty-three billion, six hundred eighty-eight million, five hundred ninety-five thousand, nine hundred twenty-one".