13221497 has 2 divisors, whose sum is σ = 13221498. Its totient is φ = 13221496.

The previous prime is 13221493. The next prime is 13221503. The reversal of 13221497 is 79412231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9461776 + 3759721 = 3076^2 + 1939^2 .

It is an emirp because it is prime and its reverse (79412231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13221497 - 2² = 13221493 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13221491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610748 + 6610749.

It is an arithmetic number, because the mean of its divisors is an integer number (6610749).

Almost surely, 2^13221497 is an apocalyptic number.

It is an amenable number.

13221497 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221497 is an equidigital number, since it uses as much as digits as its factorization.

13221497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 29.

The square root of 13221497 is about 3636.1376486596. The cubic root of 13221497 is about 236.4613747975.

The spelling of 13221497 in words is "thirteen million, two hundred twenty-one thousand, four hundred ninety-seven".