12216667 has 4 divisors (see below), whose sum is σ = 12310056. Its totient is φ = 12123280.

The previous prime is 12216661. The next prime is 12216671. The reversal of 12216667 is 76661221.

It is a happy number.

12216667 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12216667 - 2⁷ = 12216539 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12216661) 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, 46498 + ... + 46759.

It is an arithmetic number, because the mean of its divisors is an integer number (3077514).

Almost surely, 2^12216667 is an apocalyptic number.

12216667 is a deficient number, since it is larger than the sum of its proper divisors (93389).

12216667 is an equidigital number, since it uses as much as digits as its factorization.

12216667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93388.

The product of its digits is 6048, while the sum is 31.

The square root of 12216667 is about 3495.2348991162. The cubic root of 12216667 is about 230.3125366783.

Adding to 12216667 its reverse (76661221), we get a palindrome (88877888).

The spelling of 12216667 in words is "twelve million, two hundred sixteen thousand, six hundred sixty-seven".