13313221 has 2 divisors, whose sum is σ = 13313222. Its totient is φ = 13313220.

The previous prime is 13313207. The next prime is 13313257. The reversal of 13313221 is 12231331.

13313221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12285025 + 1028196 = 3505^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 13313221 - 2¹⁹ = 12788933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13313195 and 13313204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13310221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6656610 + 6656611.

It is an arithmetic number, because the mean of its divisors is an integer number (6656611).

Almost surely, 2^13313221 is an apocalyptic number.

It is an amenable number.

13313221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13313221 is an equidigital number, since it uses as much as digits as its factorization.

13313221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 16.

The square root of 13313221 is about 3648.7286827058. The cubic root of 13313221 is about 237.0069312601.

Adding to 13313221 its reverse (12231331), we get a palindrome (25544552).

The spelling of 13313221 in words is "thirteen million, three hundred thirteen thousand, two hundred twenty-one".