121665113 has 8 divisors (see below), whose sum is σ = 128198400. Its totient is φ = 115144848.

The previous prime is 121665097. The next prime is 121665119. The reversal of 121665113 is 311566121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121665113 - 2⁴ = 121665097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121665119) 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 7 ways as a sum of consecutive naturals, for example, 20408 + ... + 25686.

It is an arithmetic number, because the mean of its divisors is an integer number (16024800).

Almost surely, 2^121665113 is an apocalyptic number.

It is an amenable number.

121665113 is a deficient number, since it is larger than the sum of its proper divisors (6533287).

121665113 is a wasteful number, since it uses less digits than its factorization.

121665113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6511.

The product of its digits is 1080, while the sum is 26.

The square root of 121665113 is about 11030.1909774945. The cubic root of 121665113 is about 495.5133442629.

The spelling of 121665113 in words is "one hundred twenty-one million, six hundred sixty-five thousand, one hundred thirteen".