12217147 has 2 divisors, whose sum is σ = 12217148. Its totient is φ = 12217146.

The previous prime is 12217109. The next prime is 12217151. The reversal of 12217147 is 74171221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12217147 is a prime.

It is not a weakly prime, because it can be changed into another prime (12217157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6108573 + 6108574.

It is an arithmetic number, because the mean of its divisors is an integer number (6108574).

Almost surely, 2^12217147 is an apocalyptic number.

12217147 is a deficient number, since it is larger than the sum of its proper divisors (1).

12217147 is an equidigital number, since it uses as much as digits as its factorization.

12217147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 784, while the sum is 25.

The square root of 12217147 is about 3495.3035633547. The cubic root of 12217147 is about 230.3155530102.

Adding to 12217147 its reverse (74171221), we get a palindrome (86388368).

The spelling of 12217147 in words is "twelve million, two hundred seventeen thousand, one hundred forty-seven".