23315440621 has 4 divisors (see below), whose sum is σ = 25435026144. Its totient is φ = 21195855100.

The previous prime is 23315440613. The next prime is 23315440633. The reversal of 23315440621 is 12604451332.

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 23315440621 - 2³ = 23315440613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23315440601) 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, 1059792745 + ... + 1059792766.

It is an arithmetic number, because the mean of its divisors is an integer number (6358756536).

Almost surely, 2^23315440621 is an apocalyptic number.

It is an amenable number.

23315440621 is a deficient number, since it is larger than the sum of its proper divisors (2119585523).

23315440621 is a wasteful number, since it uses less digits than its factorization.

23315440621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119585522.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 23315440621 its reverse (12604451332), we get a palindrome (35919891953).

The spelling of 23315440621 in words is "twenty-three billion, three hundred fifteen million, four hundred forty thousand, six hundred twenty-one".