22544221 has 4 divisors (see below), whose sum is σ = 25764832. Its totient is φ = 19323612.

The previous prime is 22544213. The next prime is 22544233. The reversal of 22544221 is 12244522.

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.

It is not a de Polignac number, because 22544221 - 2³ = 22544213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22544192 and 22544201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22544201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1610295 + ... + 1610308.

It is an arithmetic number, because the mean of its divisors is an integer number (6441208).

Almost surely, 2^22544221 is an apocalyptic number.

It is an amenable number.

22544221 is a deficient number, since it is larger than the sum of its proper divisors (3220611).

22544221 is an equidigital number, since it uses as much as digits as its factorization.

22544221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220610.

The product of its digits is 1280, while the sum is 22.

The square root of 22544221 is about 4748.0755048756. The cubic root of 22544221 is about 282.4956367614.

Adding to 22544221 its reverse (12244522), we get a palindrome (34788743).

The spelling of 22544221 in words is "twenty-two million, five hundred forty-four thousand, two hundred twenty-one".