13231221097 has 2 divisors, whose sum is σ = 13231221098. Its totient is φ = 13231221096.

The previous prime is 13231221013. The next prime is 13231221103. The reversal of 13231221097 is 79012213231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11955016921 + 1276204176 = 109339^2 + 35724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13231221097 is a prime.

It is not a weakly prime, because it can be changed into another prime (13231225097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6615610548 + 6615610549.

It is an arithmetic number, because the mean of its divisors is an integer number (6615610549).

Almost surely, 2^13231221097 is an apocalyptic number.

It is an amenable number.

13231221097 is a deficient number, since it is larger than the sum of its proper divisors (1).

13231221097 is an equidigital number, since it uses as much as digits as its factorization.

13231221097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The spelling of 13231221097 in words is "thirteen billion, two hundred thirty-one million, two hundred twenty-one thousand, ninety-seven".