204145321 has 2 divisors, whose sum is σ = 204145322. Its totient is φ = 204145320.

The previous prime is 204145313. The next prime is 204145349. The reversal of 204145321 is 123541402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154654096 + 49491225 = 12436^2 + 7035^2 .

It is a cyclic number.

It is not a de Polignac number, because 204145321 - 2³ = 204145313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204145292 and 204145301.

It is not a weakly prime, because it can be changed into another prime (204145301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102072660 + 102072661.

It is an arithmetic number, because the mean of its divisors is an integer number (102072661).

Almost surely, 2^204145321 is an apocalyptic number.

It is an amenable number.

204145321 is a deficient number, since it is larger than the sum of its proper divisors (1).

204145321 is an equidigital number, since it uses as much as digits as its factorization.

204145321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 204145321 is about 14287.9432039745. The cubic root of 204145321 is about 588.8162812911.

Adding to 204145321 its reverse (123541402), we get a palindrome (327686723).

The spelling of 204145321 in words is "two hundred four million, one hundred forty-five thousand, three hundred twenty-one".