13331321 has 4 divisors (see below), whose sum is σ = 13344612. Its totient is φ = 13318032.

The previous prime is 13331309. The next prime is 13331411. The reversal of 13331321 is 12313331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11806096 + 1525225 = 3436^2 + 1235^2 .

It is a cyclic number.

It is not a de Polignac number, because 13331321 - 2¹⁰ = 13330297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13331321.

It is not an unprimeable number, because it can be changed into a prime (13331821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5006 + ... + 7191.

It is an arithmetic number, because the mean of its divisors is an integer number (3336153).

Almost surely, 2^13331321 is an apocalyptic number.

It is an amenable number.

13331321 is a deficient number, since it is larger than the sum of its proper divisors (13291).

13331321 is a wasteful number, since it uses less digits than its factorization.

13331321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13290.

The product of its digits is 162, while the sum is 17.

The square root of 13331321 is about 3651.2081562135. The cubic root of 13331321 is about 237.1142902742.

Adding to 13331321 its reverse (12313331), we get a palindrome (25644652).

The spelling of 13331321 in words is "thirteen million, three hundred thirty-one thousand, three hundred twenty-one".