13221139 has 2 divisors, whose sum is σ = 13221140. Its totient is φ = 13221138.

The previous prime is 13221137. The next prime is 13221149. The reversal of 13221139 is 93112231.

It is a weak prime.

It is an emirp because it is prime and its reverse (93112231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13221139 - 2¹ = 13221137 is a prime.

Together with 13221137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13221137) 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, 6610569 + 6610570.

It is an arithmetic number, because the mean of its divisors is an integer number (6610570).

Almost surely, 2^13221139 is an apocalyptic number.

13221139 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221139 is an equidigital number, since it uses as much as digits as its factorization.

13221139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 22.

The square root of 13221139 is about 3636.0884202670. The cubic root of 13221139 is about 236.4592405476.

The spelling of 13221139 in words is "thirteen million, two hundred twenty-one thousand, one hundred thirty-nine".