13231301221 has 2 divisors, whose sum is σ = 13231301222. Its totient is φ = 13231301220.

The previous prime is 13231301203. The next prime is 13231301231. The reversal of 13231301221 is 12210313231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7865738721 + 5365562500 = 88689^2 + 73250^2 .

It is a cyclic number.

It is not a de Polignac number, because 13231301221 - 2¹³ = 13231293029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13231301231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6615650610 + 6615650611.

It is an arithmetic number, because the mean of its divisors is an integer number (6615650611).

Almost surely, 2^13231301221 is an apocalyptic number.

It is an amenable number.

13231301221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13231301221 is an equidigital number, since it uses as much as digits as its factorization.

13231301221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 13231301221 its reverse (12210313231), we get a palindrome (25441614452).

The spelling of 13231301221 in words is "thirteen billion, two hundred thirty-one million, three hundred one thousand, two hundred twenty-one".