13221444 has 24 divisors (see below), whose sum is σ = 32665248. Its totient is φ = 4147840.

The previous prime is 13221443. The next prime is 13221457. The reversal of 13221444 is 44412231.

13221444 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 13221444.

It is not an unprimeable number, because it can be changed into a prime (13221443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32202 + ... + 32609.

It is an arithmetic number, because the mean of its divisors is an integer number (1361052).

Almost surely, 2^13221444 is an apocalyptic number.

It is an amenable number.

13221444 is an abundant number, since it is smaller than the sum of its proper divisors (19443804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13221444 is a wasteful number, since it uses less digits than its factorization.

13221444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64835 (or 64833 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 13221444 is about 3636.1303606994. The cubic root of 13221444 is about 236.4610588355.

Adding to 13221444 its reverse (44412231), we get a palindrome (57633675).

The spelling of 13221444 in words is "thirteen million, two hundred twenty-one thousand, four hundred forty-four".