13031123221 has 2 divisors, whose sum is σ = 13031123222. Its totient is φ = 13031123220.

The previous prime is 13031123207. The next prime is 13031123239. The reversal of 13031123221 is 12232113031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12332102500 + 699020721 = 111050^2 + 26439^2 .

It is a cyclic number.

It is not a de Polignac number, because 13031123221 - 2¹⁵ = 13031090453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13431123221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6515561610 + 6515561611.

It is an arithmetic number, because the mean of its divisors is an integer number (6515561611).

Almost surely, 2^13031123221 is an apocalyptic number.

It is an amenable number.

13031123221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13031123221 is an equidigital number, since it uses as much as digits as its factorization.

13031123221 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 13031123221 its reverse (12232113031), we get a palindrome (25263236252).

The spelling of 13031123221 in words is "thirteen billion, thirty-one million, one hundred twenty-three thousand, two hundred twenty-one".