121505435017 has 2 divisors, whose sum is σ = 121505435018. Its totient is φ = 121505435016.

The previous prime is 121505434969. The next prime is 121505435021. The reversal of 121505435017 is 710534505121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120838969161 + 666465856 = 347619^2 + 25816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121505435017 is a prime.

It is not a weakly prime, because it can be changed into another prime (121505435057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60752717508 + 60752717509.

It is an arithmetic number, because the mean of its divisors is an integer number (60752717509).

Almost surely, 2^121505435017 is an apocalyptic number.

It is an amenable number.

121505435017 is a deficient number, since it is larger than the sum of its proper divisors (1).

121505435017 is an equidigital number, since it uses as much as digits as its factorization.

121505435017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21000, while the sum is 34.

The spelling of 121505435017 in words is "one hundred twenty-one billion, five hundred five million, four hundred thirty-five thousand, seventeen".