12271217 has 6 divisors (see below), whose sum is σ = 14274738. Its totient is φ = 10518144.

The previous prime is 12271201. The next prime is 12271219. The reversal of 12271217 is 71217221.

It can be written as a sum of positive squares in only one way, i.e., 9834496 + 2436721 = 3136^2 + 1561^2 .

It is not a de Polignac number, because 12271217 - 2⁴ = 12271201 is a prime.

It is a super-2 number, since 2×12271217² = 301165533322178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12271192 and 12271201.

It is not an unprimeable number, because it can be changed into a prime (12271219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 125168 + ... + 125265.

It is an arithmetic number, because the mean of its divisors is an integer number (2379123).

Almost surely, 2^12271217 is an apocalyptic number.

It is an amenable number.

12271217 is a deficient number, since it is larger than the sum of its proper divisors (2003521).

12271217 is an equidigital number, since it uses as much as digits as its factorization.

12271217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250447 (or 250440 counting only the distinct ones).

The product of its digits is 392, while the sum is 23.

The square root of 12271217 is about 3503.0296887123. The cubic root of 12271217 is about 230.6548257683.

Adding to 12271217 its reverse (71217221), we get a palindrome (83488438).

The spelling of 12271217 in words is "twelve million, two hundred seventy-one thousand, two hundred seventeen".