12117220 has 12 divisors (see below), whose sum is σ = 25446204. Its totient is φ = 4846880.

The previous prime is 12117121. The next prime is 12117221. The reversal of 12117220 is 2271121.

12117220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 4848804 + 7268416 = 2202^2 + 2696^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12117194 and 12117203.

It is not an unprimeable number, because it can be changed into a prime (12117221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302911 + ... + 302950.

It is an arithmetic number, because the mean of its divisors is an integer number (2120517).

Almost surely, 2^12117220 is an apocalyptic number.

12117220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12117220 is an abundant number, since it is smaller than the sum of its proper divisors (13328984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12117220 is a wasteful number, since it uses less digits than its factorization.

12117220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605870 (or 605868 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 12117220 is about 3480.9797471402. The cubic root of 12117220 is about 229.6858976395.

Adding to 12117220 its reverse (2271121), we get a palindrome (14388341).

The spelling of 12117220 in words is "twelve million, one hundred seventeen thousand, two hundred twenty".