204221242122409 has 2 divisors, whose sum is σ = 204221242122410. Its totient is φ = 204221242122408.

The previous prime is 204221242122377. The next prime is 204221242122413. The reversal of 204221242122409 is 904221242122402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142855013126809 + 61366228995600 = 11952197^2 + 7833660^2 .

It is a cyclic number.

It is not a de Polignac number, because 204221242122409 - 2⁵ = 204221242122377 is a prime.

It is not a weakly prime, because it can be changed into another prime (204221242122509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102110621061204 + 102110621061205.

It is an arithmetic number, because the mean of its divisors is an integer number (102110621061205).

Almost surely, 2^{204221242122409} is an apocalyptic number.

It is an amenable number.

204221242122409 is a deficient number, since it is larger than the sum of its proper divisors (1).

204221242122409 is an equidigital number, since it uses as much as digits as its factorization.

204221242122409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73728, while the sum is 37.

The spelling of 204221242122409 in words is "two hundred four trillion, two hundred twenty-one billion, two hundred forty-two million, one hundred twenty-two thousand, four hundred nine".