117221181 has 24 divisors (see below), whose sum is σ = 198343584. Its totient is φ = 60893280.

The previous prime is 117221177. The next prime is 117221191. The reversal of 117221181 is 181122711.

It is not a de Polignac number, because 117221181 - 2² = 117221177 is a prime.

It is a super-2 number, since 2×117221181² = 27481610550069522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117221101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34630 + ... + 37863.

It is an arithmetic number, because the mean of its divisors is an integer number (8264316).

Almost surely, 2^117221181 is an apocalyptic number.

117221181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

117221181 is a deficient number, since it is larger than the sum of its proper divisors (81122403).

117221181 is a wasteful number, since it uses less digits than its factorization.

117221181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72521 (or 72514 counting only the distinct ones).

The product of its digits is 224, while the sum is 24.

The square root of 117221181 is about 10826.8730942964. The cubic root of 117221181 is about 489.4053330223.

Adding to 117221181 its reverse (181122711), we get a palindrome (298343892).

The spelling of 117221181 in words is "one hundred seventeen million, two hundred twenty-one thousand, one hundred eighty-one".