22743221 has 4 divisors (see below), whose sum is σ = 23527500. Its totient is φ = 21958944.

The previous prime is 22743199. The next prime is 22743239. The reversal of 22743221 is 12234722.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12234722 = 2 ⋅6117361.

It can be written as a sum of positive squares in 2 ways, for example, as 19018321 + 3724900 = 4361^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 22743221 - 2⁶ = 22743157 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 (22743821) 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, 392096 + ... + 392153.

It is an arithmetic number, because the mean of its divisors is an integer number (5881875).

Almost surely, 2^22743221 is an apocalyptic number.

It is an amenable number.

22743221 is a deficient number, since it is larger than the sum of its proper divisors (784279).

22743221 is an equidigital number, since it uses as much as digits as its factorization.

22743221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784278.

The product of its digits is 1344, while the sum is 23.

The square root of 22743221 is about 4768.9853218478. The cubic root of 22743221 is about 283.3244083309.

Adding to 22743221 its reverse (12234722), we get a palindrome (34977943).

The spelling of 22743221 in words is "twenty-two million, seven hundred forty-three thousand, two hundred twenty-one".