13233221 has 4 divisors (see below), whose sum is σ = 13414572. Its totient is φ = 13051872.

The previous prime is 13233203. The next prime is 13233229. The reversal of 13233221 is 12233231.

13233221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6002500 + 7230721 = 2450^2 + 2689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13233221 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 13233221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13233229) 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, 90566 + ... + 90711.

It is an arithmetic number, because the mean of its divisors is an integer number (3353643).

Almost surely, 2^13233221 is an apocalyptic number.

It is an amenable number.

13233221 is a deficient number, since it is larger than the sum of its proper divisors (181351).

13233221 is an equidigital number, since it uses as much as digits as its factorization.

13233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181350.

The product of its digits is 216, while the sum is 17.

The square root of 13233221 is about 3637.7494416191. The cubic root of 13233221 is about 236.5312472215.

Adding to 13233221 its reverse (12233231), we get a palindrome (25466452).

The spelling of 13233221 in words is "thirteen million, two hundred thirty-three thousand, two hundred twenty-one".