204454145321 has 2 divisors, whose sum is σ = 204454145322. Its totient is φ = 204454145320.

The previous prime is 204454145267. The next prime is 204454145351. The reversal of 204454145321 is 123541454402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203771890921 + 682254400 = 451411^2 + 26120^2 .

It is a cyclic number.

It is not a de Polignac number, because 204454145321 - 2¹⁸ = 204453883177 is a prime.

It is not a weakly prime, because it can be changed into another prime (204454145351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102227072660 + 102227072661.

It is an arithmetic number, because the mean of its divisors is an integer number (102227072661).

Almost surely, 2^204454145321 is an apocalyptic number.

It is an amenable number.

204454145321 is a deficient number, since it is larger than the sum of its proper divisors (1).

204454145321 is an equidigital number, since it uses as much as digits as its factorization.

204454145321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 204454145321 its reverse (123541454402), we get a palindrome (327995599723).

The spelling of 204454145321 in words is "two hundred four billion, four hundred fifty-four million, one hundred forty-five thousand, three hundred twenty-one".