23204221 has 4 divisors (see below), whose sum is σ = 23214652. Its totient is φ = 23193792.

The previous prime is 23204183. The next prime is 23204231. The reversal of 23204221 is 12240232.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 20124196 + 3080025 = 4486^2 + 1755^2 .

It is a cyclic number.

It is not a de Polignac number, because 23204221 - 2⁹ = 23203709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23204195 and 23204204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23204231) 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, 390 + ... + 6823.

It is an arithmetic number, because the mean of its divisors is an integer number (5803663).

Almost surely, 2^23204221 is an apocalyptic number.

It is an amenable number.

23204221 is a deficient number, since it is larger than the sum of its proper divisors (10431).

23204221 is an equidigital number, since it uses as much as digits as its factorization.

23204221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10430.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 23204221 is about 4817.0759803017. The cubic root of 23204221 is about 285.2259252995.

Adding to 23204221 its reverse (12240232), we get a palindrome (35444453).

The spelling of 23204221 in words is "twenty-three million, two hundred four thousand, two hundred twenty-one".