23520575021 has 4 divisors (see below), whose sum is σ = 23552928672. Its totient is φ = 23488221372.

The previous prime is 23520575011. The next prime is 23520575033. The reversal of 23520575021 is 12057502532.

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 23520575021 - 2¹⁴ = 23520558637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23520575011) 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, 16175735 + ... + 16177188.

It is an arithmetic number, because the mean of its divisors is an integer number (5888232168).

Almost surely, 2^23520575021 is an apocalyptic number.

It is an amenable number.

23520575021 is a deficient number, since it is larger than the sum of its proper divisors (32353651).

23520575021 is an equidigital number, since it uses as much as digits as its factorization.

23520575021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32353650.

The product of its (nonzero) digits is 21000, while the sum is 32.

The spelling of 23520575021 in words is "twenty-three billion, five hundred twenty million, five hundred seventy-five thousand, twenty-one".