204224221 has 4 divisors (see below), whose sum is σ = 205693600. Its totient is φ = 202754844.

The previous prime is 204224219. The next prime is 204224227. The reversal of 204224221 is 122422402.

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 a cyclic number.

It is not a de Polignac number, because 204224221 - 2¹ = 204224219 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 (204224227) 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, 734481 + ... + 734758.

It is an arithmetic number, because the mean of its divisors is an integer number (51423400).

Almost surely, 2^204224221 is an apocalyptic number.

It is an amenable number.

204224221 is a deficient number, since it is larger than the sum of its proper divisors (1469379).

204224221 is a wasteful number, since it uses less digits than its factorization.

204224221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469378.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 204224221 is about 14290.7040064512. The cubic root of 204224221 is about 588.8921286018.

Adding to 204224221 its reverse (122422402), we get a palindrome (326646623).

The spelling of 204224221 in words is "two hundred four million, two hundred twenty-four thousand, two hundred twenty-one".