23311320321 has 4 divisors (see below), whose sum is σ = 31081760432. Its totient is φ = 15540880212.

The previous prime is 23311320317. The next prime is 23311320359. The reversal of 23311320321 is 12302311332.

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 not a de Polignac number, because 23311320321 - 2² = 23311320317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23311324321) 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, 3885220051 + ... + 3885220056.

It is an arithmetic number, because the mean of its divisors is an integer number (7770440108).

Almost surely, 2^23311320321 is an apocalyptic number.

It is an amenable number.

23311320321 is a deficient number, since it is larger than the sum of its proper divisors (7770440111).

23311320321 is an equidigital number, since it uses as much as digits as its factorization.

23311320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7770440110.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 23311320321 its reverse (12302311332), we get a palindrome (35613631653).

The spelling of 23311320321 in words is "twenty-three billion, three hundred eleven million, three hundred twenty thousand, three hundred twenty-one".