23995688721 has 4 divisors (see below), whose sum is σ = 31994251632. Its totient is φ = 15997125812.

The previous prime is 23995688707. The next prime is 23995688729. The reversal of 23995688721 is 12788659932.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23995688721 - 2⁶ = 23995688657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23995688729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3999281451 + ... + 3999281456.

It is an arithmetic number, because the mean of its divisors is an integer number (7998562908).

Almost surely, 2^23995688721 is an apocalyptic number.

It is an amenable number.

23995688721 is a deficient number, since it is larger than the sum of its proper divisors (7998562911).

23995688721 is an equidigital number, since it uses as much as digits as its factorization.

23995688721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7998562910.

The product of its digits is 13063680, while the sum is 60.

The spelling of 23995688721 in words is "twenty-three billion, nine hundred ninety-five million, six hundred eighty-eight thousand, seven hundred twenty-one".