23031221321 has 4 divisors (see below), whose sum is σ = 23031937152. Its totient is φ = 23030505492.

The previous prime is 23031221207. The next prime is 23031221347. The reversal of 23031221321 is 12312213032.

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 23031221321 - 2³⁴ = 5851352137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23031221293 and 23031221302.

It is not an unprimeable number, because it can be changed into a prime (23031223321) 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, 307265 + ... + 374798.

It is an arithmetic number, because the mean of its divisors is an integer number (5757984288).

Almost surely, 2^23031221321 is an apocalyptic number.

It is an amenable number.

23031221321 is a deficient number, since it is larger than the sum of its proper divisors (715831).

23031221321 is an equidigital number, since it uses as much as digits as its factorization.

23031221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715830.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 23031221321 its reverse (12312213032), we get a palindrome (35343434353).

The spelling of 23031221321 in words is "twenty-three billion, thirty-one million, two hundred twenty-one thousand, three hundred twenty-one".