13253221 has 4 divisors (see below), whose sum is σ = 13829472. Its totient is φ = 12676972.

The previous prime is 13253197. The next prime is 13253237. The reversal of 13253221 is 12235231.

13253221 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13253221 - 2⁵ = 13253189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13253521) 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, 288091 + ... + 288136.

It is an arithmetic number, because the mean of its divisors is an integer number (3457368).

Almost surely, 2^13253221 is an apocalyptic number.

It is an amenable number.

13253221 is a deficient number, since it is larger than the sum of its proper divisors (576251).

13253221 is an equidigital number, since it uses as much as digits as its factorization.

13253221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576250.

The product of its digits is 360, while the sum is 19.

The square root of 13253221 is about 3640.4973561314. The cubic root of 13253221 is about 236.6503475710.

Adding to 13253221 its reverse (12235231), we get a palindrome (25488452).

The spelling of 13253221 in words is "thirteen million, two hundred fifty-three thousand, two hundred twenty-one".