13221317 has 2 divisors, whose sum is σ = 13221318. Its totient is φ = 13221316.

The previous prime is 13221293. The next prime is 13221337. The reversal of 13221317 is 71312231.

It is an a-pointer prime, because the next prime (13221337) can be obtained adding 13221317 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13147876 + 73441 = 3626^2 + 271^2 .

It is a cyclic number.

It is not a de Polignac number, because 13221317 - 2¹² = 13217221 is a prime.

It is a super-3 number, since 3×13221317³ (a number of 22 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13221337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610658 + 6610659.

It is an arithmetic number, because the mean of its divisors is an integer number (6610659).

Almost surely, 2^13221317 is an apocalyptic number.

It is an amenable number.

13221317 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221317 is an equidigital number, since it uses as much as digits as its factorization.

13221317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252, while the sum is 20.

The square root of 13221317 is about 3636.1128970372. The cubic root of 13221317 is about 236.4603017158.

Adding to 13221317 its reverse (71312231), we get a palindrome (84533548).

The spelling of 13221317 in words is "thirteen million, two hundred twenty-one thousand, three hundred seventeen".