117505821 has 16 divisors (see below), whose sum is σ = 162157248. Its totient is φ = 75628800.

The previous prime is 117505811. The next prime is 117505847. The reversal of 117505821 is 128505711.

It is not a de Polignac number, because 117505821 - 2⁵ = 117505789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117505811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10501 + ... + 18581.

It is an arithmetic number, because the mean of its divisors is an integer number (10134828).

Almost surely, 2^117505821 is an apocalyptic number.

It is an amenable number.

117505821 is a deficient number, since it is larger than the sum of its proper divisors (44651427).

117505821 is a wasteful number, since it uses less digits than its factorization.

117505821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8252.

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

The square root of 117505821 is about 10840.0101937221. The cubic root of 117505821 is about 489.8011424097.

It can be divided in two parts, 11750 and 5821, that added together give a palindrome (17571).

The spelling of 117505821 in words is "one hundred seventeen million, five hundred five thousand, eight hundred twenty-one".