205241212117 has 2 divisors, whose sum is σ = 205241212118. Its totient is φ = 205241212116.

The previous prime is 205241212097. The next prime is 205241212139. The reversal of 205241212117 is 711212142502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193352798961 + 11888413156 = 439719^2 + 109034^2 .

It is a cyclic number.

It is not a de Polignac number, because 205241212117 - 2¹⁵ = 205241179349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205241212417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102620606058 + 102620606059.

It is an arithmetic number, because the mean of its divisors is an integer number (102620606059).

Almost surely, 2^205241212117 is an apocalyptic number.

It is an amenable number.

205241212117 is a deficient number, since it is larger than the sum of its proper divisors (1).

205241212117 is an equidigital number, since it uses as much as digits as its factorization.

205241212117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 28.

Adding to 205241212117 its reverse (711212142502), we get a palindrome (916453354619).

The spelling of 205241212117 in words is "two hundred five billion, two hundred forty-one million, two hundred twelve thousand, one hundred seventeen".