23789568021 has 4 divisors (see below), whose sum is σ = 31719424032. Its totient is φ = 15859712012.

The previous prime is 23789568007. The next prime is 23789568043. The reversal of 23789568021 is 12086598732.

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 23789568021 - 2⁹ = 23789567509 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23789568091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3964928001 + ... + 3964928006.

It is an arithmetic number, because the mean of its divisors is an integer number (7929856008).

Almost surely, 2^23789568021 is an apocalyptic number.

It is an amenable number.

23789568021 is a deficient number, since it is larger than the sum of its proper divisors (7929856011).

23789568021 is an equidigital number, since it uses as much as digits as its factorization.

23789568021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7929856010.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 23789568021 in words is "twenty-three billion, seven hundred eighty-nine million, five hundred sixty-eight thousand, twenty-one".