13221911 has 2 divisors, whose sum is σ = 13221912. Its totient is φ = 13221910.

The previous prime is 13221881. The next prime is 13221917. The reversal of 13221911 is 11912231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13221911 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13221917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610955 + 6610956.

It is an arithmetic number, because the mean of its divisors is an integer number (6610956).

Almost surely, 2^13221911 is an apocalyptic number.

13221911 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221911 is an equidigital number, since it uses as much as digits as its factorization.

13221911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 20.

The square root of 13221911 is about 3636.1945767519. The cubic root of 13221911 is about 236.4638428485.

The spelling of 13221911 in words is "thirteen million, two hundred twenty-one thousand, nine hundred eleven".