23001305021 has 4 divisors (see below), whose sum is σ = 23794453500. Its totient is φ = 22208156544.

The previous prime is 23001305009. The next prime is 23001305027. The reversal of 23001305021 is 12050310032.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13551520921 + 9449784100 = 116411^2 + 97210^2 .

It is a cyclic number.

It is not a de Polignac number, because 23001305021 - 2³⁰ = 21927563197 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 (23001305027) 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, 396574196 + ... + 396574253.

It is an arithmetic number, because the mean of its divisors is an integer number (5948613375).

Almost surely, 2^23001305021 is an apocalyptic number.

It is an amenable number.

23001305021 is a deficient number, since it is larger than the sum of its proper divisors (793148479).

23001305021 is an equidigital number, since it uses as much as digits as its factorization.

23001305021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793148478.

The product of its (nonzero) digits is 180, while the sum is 17.

Adding to 23001305021 its reverse (12050310032), we get a palindrome (35051615053).

The spelling of 23001305021 in words is "twenty-three billion, one million, three hundred five thousand, twenty-one".