204000221 has 8 divisors (see below), whose sum is σ = 217452600. Its totient is φ = 190709248.

The previous prime is 204000217. The next prime is 204000241. The reversal of 204000221 is 122000402.

It can be written as a sum of positive squares in 4 ways, for example, as 17131321 + 186868900 = 4139^2 + 13670^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 204000221 - 2² = 204000217 is a prime.

It is a Duffinian number.

204000221 is a modest number, since divided by 221 gives 204 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204000241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37736 + ... + 42801.

It is an arithmetic number, because the mean of its divisors is an integer number (27181575).

Almost surely, 2^204000221 is an apocalyptic number.

It is an amenable number.

204000221 is a deficient number, since it is larger than the sum of its proper divisors (13452379).

204000221 is a wasteful number, since it uses less digits than its factorization.

204000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80703.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 204000221 is about 14282.8645936311. The cubic root of 204000221 is about 588.6767442659.

Adding to 204000221 its reverse (122000402), we get a palindrome (326000623).

The spelling of 204000221 in words is "two hundred four million, two hundred twenty-one", and thus it is an aban number.