13221944 has 16 divisors (see below), whose sum is σ = 24838920. Its totient is φ = 6598240.

The previous prime is 13221931. The next prime is 13221947. The reversal of 13221944 is 44912231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221947) 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, 3959 + ... + 6489.

Almost surely, 2^13221944 is an apocalyptic number.

It is an amenable number.

13221944 is a deficient number, since it is larger than the sum of its proper divisors (11616976).

13221944 is a wasteful number, since it uses less digits than its factorization.

13221944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3190 (or 3186 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 13221944 is about 3636.1991144600. The cubic root of 13221944 is about 236.4640395750.

The spelling of 13221944 in words is "thirteen million, two hundred twenty-one thousand, nine hundred forty-four".