13323221 has 4 divisors (see below), whose sum is σ = 13510944. Its totient is φ = 13135500.

The previous prime is 13323217. The next prime is 13323227. The reversal of 13323221 is 12232331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12232331 = 199 ⋅61469.

It is a cyclic number.

It is not a de Polignac number, because 13323221 - 2² = 13323217 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 13323221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13323227) 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, 93755 + ... + 93896.

It is an arithmetic number, because the mean of its divisors is an integer number (3377736).

Almost surely, 2^13323221 is an apocalyptic number.

It is an amenable number.

13323221 is a deficient number, since it is larger than the sum of its proper divisors (187723).

13323221 is an equidigital number, since it uses as much as digits as its factorization.

13323221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187722.

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

The square root of 13323221 is about 3650.0987657870. The cubic root of 13323221 is about 237.0662576532.

Adding to 13323221 its reverse (12232331), we get a palindrome (25555552).

The spelling of 13323221 in words is "thirteen million, three hundred twenty-three thousand, two hundred twenty-one".