13255221 has 16 divisors (see below), whose sum is σ = 20269184. Its totient is φ = 7547904.

The previous prime is 13255201. The next prime is 13255243. The reversal of 13255221 is 12255231.

It is not a de Polignac number, because 13255221 - 2⁶ = 13255157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13255201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6141 + ... + 8013.

It is an arithmetic number, because the mean of its divisors is an integer number (1266824).

Almost surely, 2^13255221 is an apocalyptic number.

It is an amenable number.

13255221 is a deficient number, since it is larger than the sum of its proper divisors (7013963).

13255221 is a wasteful number, since it uses less digits than its factorization.

13255221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220.

The product of its digits is 600, while the sum is 21.

The square root of 13255221 is about 3640.7720335116. The cubic root of 13255221 is about 236.6622510142.

The spelling of 13255221 in words is "thirteen million, two hundred fifty-five thousand, two hundred twenty-one".