13231311221 has 4 divisors (see below), whose sum is σ = 13658127744. Its totient is φ = 12804494700.

The previous prime is 13231311217. The next prime is 13231311229. The reversal of 13231311221 is 12211313231.

It is a happy number.

13231311221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13231311221 - 2² = 13231311217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13231311193 and 13231311202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231311229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213408215 + ... + 213408276.

It is an arithmetic number, because the mean of its divisors is an integer number (3414531936).

Almost surely, 2^13231311221 is an apocalyptic number.

It is an amenable number.

13231311221 is a deficient number, since it is larger than the sum of its proper divisors (426816523).

13231311221 is an equidigital number, since it uses as much as digits as its factorization.

13231311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426816522.

The product of its digits is 216, while the sum is 20.

Adding to 13231311221 its reverse (12211313231), we get a palindrome (25442624452).

The spelling of 13231311221 in words is "thirteen billion, two hundred thirty-one million, three hundred eleven thousand, two hundred twenty-one".