12216117 has 4 divisors (see below), whose sum is σ = 16288160. Its totient is φ = 8144076.

The previous prime is 12216103. The next prime is 12216119. The reversal of 12216117 is 71161221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71161221 = 3 ⋅23720407.

It is not a de Polignac number, because 12216117 - 2⁴ = 12216101 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 12216093 and 12216102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12216119) 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, 2036017 + ... + 2036022.

It is an arithmetic number, because the mean of its divisors is an integer number (4072040).

Almost surely, 2^12216117 is an apocalyptic number.

It is an amenable number.

12216117 is a deficient number, since it is larger than the sum of its proper divisors (4072043).

12216117 is an equidigital number, since it uses as much as digits as its factorization.

12216117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072042.

The product of its digits is 168, while the sum is 21.

The square root of 12216117 is about 3495.1562196846. The cubic root of 12216117 is about 230.3090803674.

Adding to 12216117 its reverse (71161221), we get a palindrome (83377338).

The spelling of 12216117 in words is "twelve million, two hundred sixteen thousand, one hundred seventeen".