23231220321 has 4 divisors (see below), whose sum is σ = 30974960432. Its totient is φ = 15487480212.

The previous prime is 23231220253. The next prime is 23231220329. The reversal of 23231220321 is 12302213232.

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 not a de Polignac number, because 23231220321 - 2¹¹ = 23231218273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23231220329) 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, 3871870051 + ... + 3871870056.

It is an arithmetic number, because the mean of its divisors is an integer number (7743740108).

Almost surely, 2^23231220321 is an apocalyptic number.

It is an amenable number.

23231220321 is a deficient number, since it is larger than the sum of its proper divisors (7743740111).

23231220321 is an equidigital number, since it uses as much as digits as its factorization.

23231220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7743740110.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 23231220321 its reverse (12302213232), we get a palindrome (35533433553).

The spelling of 23231220321 in words is "twenty-three billion, two hundred thirty-one million, two hundred twenty thousand, three hundred twenty-one".