121505170189 has 16 divisors (see below), whose sum is σ = 137946654720. Its totient is φ = 106231207680.

The previous prime is 121505170181. The next prime is 121505170207. The reversal of 121505170189 is 981071505121.

It is not a de Polignac number, because 121505170189 - 2³ = 121505170181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121505170181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3188524 + ... + 3226405.

It is an arithmetic number, because the mean of its divisors is an integer number (8621665920).

Almost surely, 2^121505170189 is an apocalyptic number.

It is an amenable number.

121505170189 is a deficient number, since it is larger than the sum of its proper divisors (16441484531).

121505170189 is a wasteful number, since it uses less digits than its factorization.

121505170189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6415020.

The product of its (nonzero) digits is 25200, while the sum is 40.

The spelling of 121505170189 in words is "one hundred twenty-one billion, five hundred five million, one hundred seventy thousand, one hundred eighty-nine".