13231022221 has 2 divisors, whose sum is σ = 13231022222. Its totient is φ = 13231022220.

The previous prime is 13231022201. The next prime is 13231022249. The reversal of 13231022221 is 12222013231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11883398121 + 1347624100 = 109011^2 + 36710^2 .

It is an emirp because it is prime and its reverse (12222013231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13231022221 - 2⁷ = 13231022093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13231022201) 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 as a sum of consecutive naturals, namely, 6615511110 + 6615511111.

It is an arithmetic number, because the mean of its divisors is an integer number (6615511111).

Almost surely, 2^13231022221 is an apocalyptic number.

It is an amenable number.

13231022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13231022221 is an equidigital number, since it uses as much as digits as its factorization.

13231022221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 13231022221 its reverse (12222013231), we get a palindrome (25453035452).

The spelling of 13231022221 in words is "thirteen billion, two hundred thirty-one million, twenty-two thousand, two hundred twenty-one".