204456456221 has 2 divisors, whose sum is σ = 204456456222. Its totient is φ = 204456456220.

The previous prime is 204456456203. The next prime is 204456456227. The reversal of 204456456221 is 122654654402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195213748900 + 9242707321 = 441830^2 + 96139^2 .

It is a cyclic number.

It is not a de Polignac number, because 204456456221 - 2³⁰ = 203382714397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204456456227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102228228110 + 102228228111.

It is an arithmetic number, because the mean of its divisors is an integer number (102228228111).

Almost surely, 2^204456456221 is an apocalyptic number.

It is an amenable number.

204456456221 is a deficient number, since it is larger than the sum of its proper divisors (1).

204456456221 is an equidigital number, since it uses as much as digits as its factorization.

204456456221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 460800, while the sum is 41.

The spelling of 204456456221 in words is "two hundred four billion, four hundred fifty-six million, four hundred fifty-six thousand, two hundred twenty-one".