12142217 has 2 divisors, whose sum is σ = 12142218. Its totient is φ = 12142216.

The previous prime is 12142177. The next prime is 12142219. The reversal of 12142217 is 71224121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7284601 + 4857616 = 2699^2 + 2204^2 .

It is a cyclic number.

It is not a de Polignac number, because 12142217 - 2¹⁰ = 12141193 is a prime.

Together with 12142219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12142219) by changing a digit.

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 as a sum of consecutive naturals, namely, 6071108 + 6071109.

It is an arithmetic number, because the mean of its divisors is an integer number (6071109).

Almost surely, 2^12142217 is an apocalyptic number.

It is an amenable number.

12142217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12142217 is an equidigital number, since it uses as much as digits as its factorization.

12142217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 224, while the sum is 20.

The square root of 12142217 is about 3484.5684094304. The cubic root of 12142217 is about 229.8437312796.

Adding to 12142217 its reverse (71224121), we get a palindrome (83366338).

The spelling of 12142217 in words is "twelve million, one hundred forty-two thousand, two hundred seventeen".