117921 has 8 divisors (see below), whose sum is σ = 164160. Its totient is φ = 75152.

The previous prime is 117917. The next prime is 117937. The reversal of 117921 is 129711.

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 117921 - 2² = 117917 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 117921.

It is not an unprimeable number, because it can be changed into a prime (117911) 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, 786 + ... + 923.

It is an arithmetic number, because the mean of its divisors is an integer number (20520).

2¹¹⁷⁹²¹ is an apocalyptic number.

It is an amenable number.

117921 is a deficient number, since it is larger than the sum of its proper divisors (46239).

117921 is a wasteful number, since it uses less digits than its factorization.

117921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735.

The product of its digits is 126, while the sum is 21.

The square root of 117921 is about 343.3962725482. The cubic root of 117921 is about 49.0377329794.

The spelling of 117921 in words is "one hundred seventeen thousand, nine hundred twenty-one".