13221232 has 20 divisors (see below), whose sum is σ = 25708176. Its totient is φ = 6586880.

The previous prime is 13221227. The next prime is 13221233. The reversal of 13221232 is 23212231.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3648 + ... + 6304.

Almost surely, 2^13221232 is an apocalyptic number.

It is an amenable number.

13221232 is a deficient number, since it is larger than the sum of its proper divisors (12486944).

13221232 is a wasteful number, since it uses less digits than its factorization.

13221232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976 (or 2970 counting only the distinct ones).

The product of its digits is 144, while the sum is 16.

The square root of 13221232 is about 3636.1012087124. The cubic root of 13221232 is about 236.4597949793.

Adding to 13221232 its reverse (23212231), we get a palindrome (36433463).

Subtracting 13221232 from its reverse (23212231), we obtain a palindrome (9990999).

The spelling of 13221232 in words is "thirteen million, two hundred twenty-one thousand, two hundred thirty-two".