13231232321 has 4 divisors (see below), whose sum is σ = 13305150000. Its totient is φ = 13157314644.

The previous prime is 13231232297. The next prime is 13231232341. The reversal of 13231232321 is 12323213231.

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 13231232321 - 2²² = 13227038017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13231232341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36958571 + ... + 36958928.

It is an arithmetic number, because the mean of its divisors is an integer number (3326287500).

Almost surely, 2^13231232321 is an apocalyptic number.

It is an amenable number.

13231232321 is a deficient number, since it is larger than the sum of its proper divisors (73917679).

13231232321 is an equidigital number, since it uses as much as digits as its factorization.

13231232321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73917678.

The product of its digits is 1296, while the sum is 23.

Adding to 13231232321 its reverse (12323213231), we get a palindrome (25554445552).

The spelling of 13231232321 in words is "thirteen billion, two hundred thirty-one million, two hundred thirty-two thousand, three hundred twenty-one".