22923221 has 4 divisors (see below), whose sum is σ = 22995852. Its totient is φ = 22850592.

The previous prime is 22923217. The next prime is 22923233. The reversal of 22923221 is 12232922.

22923221 = 3385² + 3386².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11464996 + 11458225 = 3386^2 + 3385^2 .

It is a cyclic number.

It is not a de Polignac number, because 22923221 - 2² = 22923217 is a prime.

It is a super-2 number, since 2×22923221² = 1050948122029682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22923281) 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, 35840 + ... + 36473.

It is an arithmetic number, because the mean of its divisors is an integer number (5748963).

Almost surely, 2^22923221 is an apocalyptic number.

22923221 is the 3386-th centered square number.

It is an amenable number.

22923221 is a deficient number, since it is larger than the sum of its proper divisors (72631).

22923221 is an equidigital number, since it uses as much as digits as its factorization.

22923221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72630.

The product of its digits is 864, while the sum is 23.

The square root of 22923221 is about 4787.8200676299. The cubic root of 22923221 is about 284.0698969993.

The spelling of 22923221 in words is "twenty-two million, nine hundred twenty-three thousand, two hundred twenty-one".