13221344231 has 2 divisors, whose sum is σ = 13221344232. Its totient is φ = 13221344230.

The previous prime is 13221344179. The next prime is 13221344243. The reversal of 13221344231 is 13244312231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13221344231 is a prime.

It is a super-2 number, since 2×13221344231² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13221344231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13221343231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610672115 + 6610672116.

It is an arithmetic number, because the mean of its divisors is an integer number (6610672116).

Almost surely, 2^13221344231 is an apocalyptic number.

13221344231 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221344231 is an equidigital number, since it uses as much as digits as its factorization.

13221344231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 26.

Adding to 13221344231 its reverse (13244312231), we get a palindrome (26465656462).

The spelling of 13221344231 in words is "thirteen billion, two hundred twenty-one million, three hundred forty-four thousand, two hundred thirty-one".