13221697 has 2 divisors, whose sum is σ = 13221698. Its totient is φ = 13221696.

The previous prime is 13221679. The next prime is 13221737. The reversal of 13221697 is 79612231.

Together with previous prime (13221679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12173121 + 1048576 = 3489^2 + 1024^2 .

It is a cyclic number.

It is not a de Polignac number, because 13221697 - 2¹⁹ = 12697409 is a prime.

It is not a weakly prime, because it can be changed into another prime (13221647) 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, 6610848 + 6610849.

It is an arithmetic number, because the mean of its divisors is an integer number (6610849).

Almost surely, 2^13221697 is an apocalyptic number.

It is an amenable number.

13221697 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221697 is an equidigital number, since it uses as much as digits as its factorization.

13221697 is an odious number, because the sum of its binary digits is odd.

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

The square root of 13221697 is about 3636.1651502648. The cubic root of 13221697 is about 236.4625670991.

The spelling of 13221697 in words is "thirteen million, two hundred twenty-one thousand, six hundred ninety-seven".