12216065 has 4 divisors (see below), whose sum is σ = 14659284. Its totient is φ = 9772848.

The previous prime is 12216041. The next prime is 12216079. The reversal of 12216065 is 56061221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1982464 + 10233601 = 1408^2 + 3199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12216065 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12216065.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1221602 + ... + 1221611.

It is an arithmetic number, because the mean of its divisors is an integer number (3664821).

Almost surely, 2^12216065 is an apocalyptic number.

It is an amenable number.

12216065 is a deficient number, since it is larger than the sum of its proper divisors (2443219).

12216065 is an equidigital number, since it uses as much as digits as its factorization.

12216065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443218.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 12216065 is about 3495.1487808103. The cubic root of 12216065 is about 230.3087535836.

Adding to 12216065 its reverse (56061221), we get a palindrome (68277286).

The spelling of 12216065 in words is "twelve million, two hundred sixteen thousand, sixty-five".