12216717 has 16 divisors (see below), whose sum is σ = 18408000. Its totient is φ = 8005392.

The previous prime is 12216671. The next prime is 12216719. The reversal of 12216717 is 71761221.

It is not a de Polignac number, because 12216717 - 2¹⁴ = 12200333 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12216719) 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 15 ways as a sum of consecutive naturals, for example, 2242 + ... + 5427.

It is an arithmetic number, because the mean of its divisors is an integer number (1150500).

Almost surely, 2^12216717 is an apocalyptic number.

It is an amenable number.

12216717 is a deficient number, since it is larger than the sum of its proper divisors (6191283).

12216717 is an equidigital number, since it uses as much as digits as its factorization.

12216717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7737 (or 7731 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 12216717 is about 3495.2420517040. The cubic root of 12216717 is about 230.3128508832.

Adding to 12216717 its reverse (71761221), we get a palindrome (83977938).

The spelling of 12216717 in words is "twelve million, two hundred sixteen thousand, seven hundred seventeen".