117855021 has 8 divisors (see below), whose sum is σ = 157397184. Its totient is φ = 78441440.

The previous prime is 117855011. The next prime is 117855029. The reversal of 117855021 is 120558711.

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 117855021 - 2¹⁵ = 117822253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 117855021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117855029) 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, 29985 + ... + 33686.

It is an arithmetic number, because the mean of its divisors is an integer number (19674648).

Almost surely, 2^117855021 is an apocalyptic number.

It is an amenable number.

117855021 is a deficient number, since it is larger than the sum of its proper divisors (39542163).

117855021 is an equidigital number, since it uses as much as digits as its factorization.

117855021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64291.

The product of its (nonzero) digits is 2800, while the sum is 30.

The square root of 117855021 is about 10856.1052408311. The cubic root of 117855021 is about 490.2858543093.

The spelling of 117855021 in words is "one hundred seventeen million, eight hundred fifty-five thousand, twenty-one".