204404221 has 8 divisors (see below), whose sum is σ = 235873664. Its totient is φ = 173502000.

The previous prime is 204404219. The next prime is 204404251. The reversal of 204404221 is 122404402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 204404221 - 2¹ = 204404219 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 (204404251) 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 7 ways as a sum of consecutive naturals, for example, 141030 + ... + 142471.

It is an arithmetic number, because the mean of its divisors is an integer number (29484208).

Almost surely, 2^204404221 is an apocalyptic number.

It is an amenable number.

204404221 is a deficient number, since it is larger than the sum of its proper divisors (31469443).

204404221 is a wasteful number, since it uses less digits than its factorization.

204404221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283611.

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

The square root of 204404221 is about 14297.0004196685. Note that the first 3 decimals coincide. The cubic root of 204404221 is about 589.0650912006.

Adding to 204404221 its reverse (122404402), we get a palindrome (326808623).

The spelling of 204404221 in words is "two hundred four million, four hundred four thousand, two hundred twenty-one".