13221304 has 16 divisors (see below), whose sum is σ = 25036920. Its totient is φ = 6544800.

The previous prime is 13221293. The next prime is 13221317. The reversal of 13221304 is 40312231.

It is a happy number.

It is a super-3 number, since 3×13221304³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7374 + ... + 8989.

Almost surely, 2^13221304 is an apocalyptic number.

It is an amenable number.

13221304 is a deficient number, since it is larger than the sum of its proper divisors (11815616).

13221304 is a wasteful number, since it uses less digits than its factorization.

13221304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16470 (or 16466 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 13221304 is about 3636.1111094135. Note that the first 4 decimals coincide. The cubic root of 13221304 is about 236.4602242150.

Adding to 13221304 its reverse (40312231), we get a palindrome (53533535).

The spelling of 13221304 in words is "thirteen million, two hundred twenty-one thousand, three hundred four".