121665207 has 8 divisors (see below), whose sum is σ = 162338176. Its totient is φ = 81051192.

The previous prime is 121665169. The next prime is 121665241. The reversal of 121665207 is 702566121.

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

It is not a de Polignac number, because 121665207 - 2⁶ = 121665143 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 (121665007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9673 + ... + 18354.

It is an arithmetic number, because the mean of its divisors is an integer number (20292272).

Almost surely, 2^121665207 is an apocalyptic number.

121665207 is a deficient number, since it is larger than the sum of its proper divisors (40672969).

121665207 is a wasteful number, since it uses less digits than its factorization.

121665207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29477.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 121665207 is about 11030.1952385259. The cubic root of 121665207 is about 495.5134718762.

The spelling of 121665207 in words is "one hundred twenty-one million, six hundred sixty-five thousand, two hundred seven".