121680117 has 16 divisors (see below), whose sum is σ = 194134080. Its totient is φ = 74879856.

The previous prime is 121680109. The next prime is 121680121. The reversal of 121680117 is 711086121.

It is not a de Polignac number, because 121680117 - 2³ = 121680109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121680137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172983 + ... + 173684.

It is an arithmetic number, because the mean of its divisors is an integer number (12133380).

Almost surely, 2^121680117 is an apocalyptic number.

It is an amenable number.

121680117 is a deficient number, since it is larger than the sum of its proper divisors (72453963).

121680117 is a wasteful number, since it uses less digits than its factorization.

121680117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346689 (or 346683 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 27.

The square root of 121680117 is about 11030.8710898097. The cubic root of 121680117 is about 495.5337126781.

The spelling of 121680117 in words is "one hundred twenty-one million, six hundred eighty thousand, one hundred seventeen".