13225221 has 8 divisors (see below), whose sum is σ = 19592960. Its totient is φ = 8816796.

The previous prime is 13225217. The next prime is 13225229. The reversal of 13225221 is 12252231.

It is not a de Polignac number, because 13225221 - 2² = 13225217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13225194 and 13225203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13225229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244885 + ... + 244938.

It is an arithmetic number, because the mean of its divisors is an integer number (2449120).

Almost surely, 2^13225221 is an apocalyptic number.

It is an amenable number.

13225221 is a deficient number, since it is larger than the sum of its proper divisors (6367739).

13225221 is an equidigital number, since it uses as much as digits as its factorization.

13225221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489832 (or 489826 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 13225221 is about 3636.6496944303. The cubic root of 13225221 is about 236.4835734814.

Adding to 13225221 its reverse (12252231), we get a palindrome (25477452).

The spelling of 13225221 in words is "thirteen million, two hundred twenty-five thousand, two hundred twenty-one".