121304642208817 has 2 divisors, whose sum is σ = 121304642208818. Its totient is φ = 121304642208816.

The previous prime is 121304642208809. The next prime is 121304642208847. The reversal of 121304642208817 is 718802246403121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64844431180816 + 56460211028001 = 8052604^2 + 7514001^2 .

It is a cyclic number.

It is not a de Polignac number, because 121304642208817 - 2³ = 121304642208809 is a prime.

It is not a weakly prime, because it can be changed into another prime (121304642208847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60652321104408 + 60652321104409.

It is an arithmetic number, because the mean of its divisors is an integer number (60652321104409).

Almost surely, 2^{121304642208817} is an apocalyptic number.

It is an amenable number.

121304642208817 is a deficient number, since it is larger than the sum of its proper divisors (1).

121304642208817 is an equidigital number, since it uses as much as digits as its factorization.

121304642208817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1032192, while the sum is 49.

The spelling of 121304642208817 in words is "one hundred twenty-one trillion, three hundred four billion, six hundred forty-two million, two hundred eight thousand, eight hundred seventeen".