13221287 has 2 divisors, whose sum is σ = 13221288. Its totient is φ = 13221286.

The previous prime is 13221269. The next prime is 13221289. The reversal of 13221287 is 78212231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13221287 - 2⁸ = 13221031 is a prime.

It is a super-3 number, since 3×13221287³ (a number of 22 digits) contains 333 as substring.

Together with 13221289, 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 (13221289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610643 + 6610644.

It is an arithmetic number, because the mean of its divisors is an integer number (6610644).

Almost surely, 2^13221287 is an apocalyptic number.

13221287 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221287 is an equidigital number, since it uses as much as digits as its factorization.

13221287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 26.

The square root of 13221287 is about 3636.1087717504. The cubic root of 13221287 is about 236.4601228679.

The spelling of 13221287 in words is "thirteen million, two hundred twenty-one thousand, two hundred eighty-seven".