12218117 has 4 divisors (see below), whose sum is σ = 12418476. Its totient is φ = 12017760.

The previous prime is 12218113. The next prime is 12218119. The reversal of 12218117 is 71181221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71181221 = 89 ⋅799789.

It can be written as a sum of positive squares in 2 ways, for example, as 4456321 + 7761796 = 2111^2 + 2786^2 .

It is a cyclic number.

It is not a de Polignac number, because 12218117 - 2² = 12218113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12218092 and 12218101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12218111) 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 3 ways as a sum of consecutive naturals, for example, 100088 + ... + 100209.

It is an arithmetic number, because the mean of its divisors is an integer number (3104619).

Almost surely, 2^12218117 is an apocalyptic number.

It is an amenable number.

12218117 is a deficient number, since it is larger than the sum of its proper divisors (200359).

12218117 is an equidigital number, since it uses as much as digits as its factorization.

12218117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200358.

The product of its digits is 224, while the sum is 23.

The square root of 12218117 is about 3495.4423182195. The cubic root of 12218117 is about 230.3216482733.

Adding to 12218117 its reverse (71181221), we get a palindrome (83399338).

The spelling of 12218117 in words is "twelve million, two hundred eighteen thousand, one hundred seventeen".