121085562817 has 2 divisors, whose sum is σ = 121085562818. Its totient is φ = 121085562816.

The previous prime is 121085562799. The next prime is 121085562841. The reversal of 121085562817 is 718265580121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105731626896 + 15353935921 = 325164^2 + 123911^2 .

It is a cyclic number.

It is not a de Polignac number, because 121085562817 - 2²⁷ = 120951345089 is a prime.

It is not a weakly prime, because it can be changed into another prime (121085562877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60542781408 + 60542781409.

It is an arithmetic number, because the mean of its divisors is an integer number (60542781409).

Almost surely, 2^121085562817 is an apocalyptic number.

It is an amenable number.

121085562817 is a deficient number, since it is larger than the sum of its proper divisors (1).

121085562817 is an equidigital number, since it uses as much as digits as its factorization.

121085562817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 268800, while the sum is 46.

The spelling of 121085562817 in words is "one hundred twenty-one billion, eighty-five million, five hundred sixty-two thousand, eight hundred seventeen".