12217213 has 4 divisors (see below), whose sum is σ = 12233340. Its totient is φ = 12201088.

The previous prime is 12217211. The next prime is 12217241. The reversal of 12217213 is 31271221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31271221 = 3299 ⋅9479.

It can be written as a sum of positive squares in 2 ways, for example, as 3229209 + 8988004 = 1797^2 + 2998^2 .

It is a cyclic number.

It is not a de Polignac number, because 12217213 - 2¹ = 12217211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12217211) 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, 6868 + ... + 8461.

It is an arithmetic number, because the mean of its divisors is an integer number (3058335).

Almost surely, 2^12217213 is an apocalyptic number.

It is an amenable number.

12217213 is a deficient number, since it is larger than the sum of its proper divisors (16127).

12217213 is an equidigital number, since it uses as much as digits as its factorization.

12217213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16126.

The product of its digits is 168, while the sum is 19.

The square root of 12217213 is about 3495.3130045820. The cubic root of 12217213 is about 230.3159677497.

Adding to 12217213 its reverse (31271221), we get a palindrome (43488434).

The spelling of 12217213 in words is "twelve million, two hundred seventeen thousand, two hundred thirteen".