121907 has 8 divisors (see below), whose sum is σ = 132192. Its totient is φ = 112000.

The previous prime is 121889. The next prime is 121909. The reversal of 121907 is 709121.

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 121907 - 2⁶ = 121843 is a prime.

It is a super-2 number, since 2×121907² = 29722633298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121909) 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, 1157 + ... + 1257.

It is an arithmetic number, because the mean of its divisors is an integer number (16524).

2¹²¹⁹⁰⁷ is an apocalyptic number.

121907 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

121907 is a deficient number, since it is larger than the sum of its proper divisors (10285).

121907 is a wasteful number, since it uses less digits than its factorization.

121907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 121907 is about 349.1518294381. The cubic root of 121907 is about 49.5841509802.

The spelling of 121907 in words is "one hundred twenty-one thousand, nine hundred seven".