13372221 has 4 divisors (see below), whose sum is σ = 17829632. Its totient is φ = 8914812.

The previous prime is 13372201. The next prime is 13372267. The reversal of 13372221 is 12227331.

13372221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12227331 = 3 ⋅4075777.

It is not a de Polignac number, because 13372221 - 2⁵ = 13372189 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 (13372201) 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, 2228701 + ... + 2228706.

It is an arithmetic number, because the mean of its divisors is an integer number (4457408).

Almost surely, 2^13372221 is an apocalyptic number.

It is an amenable number.

13372221 is a deficient number, since it is larger than the sum of its proper divisors (4457411).

13372221 is an equidigital number, since it uses as much as digits as its factorization.

13372221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4457410.

The product of its digits is 504, while the sum is 21.

The square root of 13372221 is about 3656.8047527862. The cubic root of 13372221 is about 237.3565286757.

Adding to 13372221 its reverse (12227331), we get a palindrome (25599552).

The spelling of 13372221 in words is "thirteen million, three hundred seventy-two thousand, two hundred twenty-one".