204006221 has 2 divisors, whose sum is σ = 204006222. Its totient is φ = 204006220.

The previous prime is 204006167. The next prime is 204006241. The reversal of 204006221 is 122600402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203632900 + 373321 = 14270^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 204006221 - 2⁶ = 204006157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204006221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204006241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102003110 + 102003111.

It is an arithmetic number, because the mean of its divisors is an integer number (102003111).

Almost surely, 2^204006221 is an apocalyptic number.

It is an amenable number.

204006221 is a deficient number, since it is larger than the sum of its proper divisors (1).

204006221 is an equidigital number, since it uses as much as digits as its factorization.

204006221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 204006221 is about 14283.0746339855. The cubic root of 204006221 is about 588.6825155437.

Adding to 204006221 its reverse (122600402), we get a palindrome (326606623).

The spelling of 204006221 in words is "two hundred four million, six thousand, two hundred twenty-one".