12170217 has 4 divisors (see below), whose sum is σ = 16226960. Its totient is φ = 8113476.

The previous prime is 12170209. The next prime is 12170219. The reversal of 12170217 is 71207121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12170217 - 2³ = 12170209 is a prime.

It is a super-2 number, since 2×12170217² = 296228363654178, 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 = 12170193 and 12170202.

It is not an unprimeable number, because it can be changed into a prime (12170219) 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, 2028367 + ... + 2028372.

It is an arithmetic number, because the mean of its divisors is an integer number (4056740).

Almost surely, 2^12170217 is an apocalyptic number.

It is an amenable number.

12170217 is a deficient number, since it is larger than the sum of its proper divisors (4056743).

12170217 is an equidigital number, since it uses as much as digits as its factorization.

12170217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4056742.

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 12170217 is about 3488.5838100868. The cubic root of 12170217 is about 230.0202691652.

Adding to 12170217 its reverse (71207121), we get a palindrome (83377338).

The spelling of 12170217 in words is "twelve million, one hundred seventy thousand, two hundred seventeen".