204221321 has 2 divisors, whose sum is σ = 204221322. Its totient is φ = 204221320.

The previous prime is 204221299. The next prime is 204221327. The reversal of 204221321 is 123122402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200364025 + 3857296 = 14155^2 + 1964^2 .

It is a cyclic number.

It is not a de Polignac number, because 204221321 - 2¹⁰ = 204220297 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204221321.

It is not a weakly prime, because it can be changed into another prime (204221327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102110660 + 102110661.

It is an arithmetic number, because the mean of its divisors is an integer number (102110661).

Almost surely, 2^204221321 is an apocalyptic number.

It is an amenable number.

204221321 is a deficient number, since it is larger than the sum of its proper divisors (1).

204221321 is an equidigital number, since it uses as much as digits as its factorization.

204221321 is an evil number, because the sum of its binary digits is even.

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

The square root of 204221321 is about 14290.6025415306. The cubic root of 204221321 is about 588.8893411505.

Adding to 204221321 its reverse (123122402), we get a palindrome (327343723).

The spelling of 204221321 in words is "two hundred four million, two hundred twenty-one thousand, three hundred twenty-one".