13221493 has 2 divisors, whose sum is σ = 13221494. Its totient is φ = 13221492.

The previous prime is 13221491. The next prime is 13221497. The reversal of 13221493 is 39412231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8803089 + 4418404 = 2967^2 + 2102^2 .

It is a cyclic number.

It is not a de Polignac number, because 13221493 - 2¹ = 13221491 is a prime.

Together with 13221491, it forms a pair of twin primes.

It is a congruent number.

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, 6610746 + 6610747.

It is an arithmetic number, because the mean of its divisors is an integer number (6610747).

Almost surely, 2^13221493 is an apocalyptic number.

It is an amenable number.

13221493 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221493 is an equidigital number, since it uses as much as digits as its factorization.

13221493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 13221493 is about 3636.1370986254. The cubic root of 13221493 is about 236.4613509513.

The spelling of 13221493 in words is "thirteen million, two hundred twenty-one thousand, four hundred ninety-three".