204785322421 has 2 divisors, whose sum is σ = 204785322422. Its totient is φ = 204785322420.

The previous prime is 204785322377. The next prime is 204785322449. The reversal of 204785322421 is 124223587402.

204785322421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199728548100 + 5056774321 = 446910^2 + 71111^2 .

It is a cyclic number.

It is not a de Polignac number, because 204785322421 - 2¹⁷ = 204785191349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204785322451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102392661210 + 102392661211.

It is an arithmetic number, because the mean of its divisors is an integer number (102392661211).

Almost surely, 2^204785322421 is an apocalyptic number.

It is an amenable number.

204785322421 is a deficient number, since it is larger than the sum of its proper divisors (1).

204785322421 is an equidigital number, since it uses as much as digits as its factorization.

204785322421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 215040, while the sum is 40.

The spelling of 204785322421 in words is "two hundred four billion, seven hundred eighty-five million, three hundred twenty-two thousand, four hundred twenty-one".