13221149 has 2 divisors, whose sum is σ = 13221150. Its totient is φ = 13221148.

The previous prime is 13221139. The next prime is 13221151. The reversal of 13221149 is 94112231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12201049 + 1020100 = 3493^2 + 1010^2 .

It is an emirp because it is prime and its reverse (94112231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13221149 - 2¹⁶ = 13155613 is a prime.

Together with 13221151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13221139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610574 + 6610575.

It is an arithmetic number, because the mean of its divisors is an integer number (6610575).

Almost surely, 2^13221149 is an apocalyptic number.

It is an amenable number.

13221149 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221149 is an equidigital number, since it uses as much as digits as its factorization.

13221149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

The square root of 13221149 is about 3636.0897953708. The cubic root of 13221149 is about 236.4593001640.

The spelling of 13221149 in words is "thirteen million, two hundred twenty-one thousand, one hundred forty-nine".