204121441122281 has 2 divisors, whose sum is σ = 204121441122282. Its totient is φ = 204121441122280.

The previous prime is 204121441122239. The next prime is 204121441122451. The reversal of 204121441122281 is 182221144121402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187979455513600 + 16141985608681 = 13710560^2 + 4017709^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204121441122281 is a prime.

It is a super-2 number, since 2×204121441122281² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204121441122881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102060720561140 + 102060720561141.

It is an arithmetic number, because the mean of its divisors is an integer number (102060720561141).

Almost surely, 2^{204121441122281} is an apocalyptic number.

It is an amenable number.

204121441122281 is a deficient number, since it is larger than the sum of its proper divisors (1).

204121441122281 is an equidigital number, since it uses as much as digits as its factorization.

204121441122281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16384, while the sum is 35.

Adding to 204121441122281 its reverse (182221144121402), we get a palindrome (386342585243683).

The spelling of 204121441122281 in words is "two hundred four trillion, one hundred twenty-one billion, four hundred forty-one million, one hundred twenty-two thousand, two hundred eighty-one".