13244221 has 4 divisors (see below), whose sum is σ = 13269244. Its totient is φ = 13219200.

The previous prime is 13244219. The next prime is 13244233. The reversal of 13244221 is 12244231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12244231 = 277 ⋅44203.

It can be written as a sum of positive squares in 2 ways, for example, as 1920996 + 11323225 = 1386^2 + 3365^2 .

It is a cyclic number.

It is not a de Polignac number, because 13244221 - 2¹ = 13244219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13244281) 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, 11700 + ... + 12781.

It is an arithmetic number, because the mean of its divisors is an integer number (3317311).

Almost surely, 2^13244221 is an apocalyptic number.

It is an amenable number.

13244221 is a deficient number, since it is larger than the sum of its proper divisors (25023).

13244221 is an equidigital number, since it uses as much as digits as its factorization.

13244221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25022.

The product of its digits is 384, while the sum is 19.

The square root of 13244221 is about 3639.2610513674. The cubic root of 13244221 is about 236.5967672521.

Adding to 13244221 its reverse (12244231), we get a palindrome (25488452).

The spelling of 13244221 in words is "thirteen million, two hundred forty-four thousand, two hundred twenty-one".