23021521233 has 4 divisors (see below), whose sum is σ = 30695361648. Its totient is φ = 15347680820.

The previous prime is 23021521217. The next prime is 23021521291. The reversal of 23021521233 is 33212512032.

It is a happy number.

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 23021521233 - 2⁴ = 23021521217 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23021521213) 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, 3836920203 + ... + 3836920208.

It is an arithmetic number, because the mean of its divisors is an integer number (7673840412).

Almost surely, 2^23021521233 is an apocalyptic number.

It is an amenable number.

23021521233 is a deficient number, since it is larger than the sum of its proper divisors (7673840415).

23021521233 is an equidigital number, since it uses as much as digits as its factorization.

23021521233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7673840414.

The product of its (nonzero) digits is 2160, while the sum is 24.

The spelling of 23021521233 in words is "twenty-three billion, twenty-one million, five hundred twenty-one thousand, two hundred thirty-three".