12213213 has 4 divisors (see below), whose sum is σ = 16284288. Its totient is φ = 8142140.

The previous prime is 12213199. The next prime is 12213221. The reversal of 12213213 is 31231221.

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 a cyclic number.

It is not a de Polignac number, because 12213213 - 2⁴ = 12213197 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12213192 and 12213201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213283) 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, 2035533 + ... + 2035538.

It is an arithmetic number, because the mean of its divisors is an integer number (4071072).

Almost surely, 2^12213213 is an apocalyptic number.

It is an amenable number.

12213213 is a deficient number, since it is larger than the sum of its proper divisors (4071075).

12213213 is an equidigital number, since it uses as much as digits as its factorization.

12213213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4071074.

The product of its digits is 72, while the sum is 15.

The square root of 12213213 is about 3494.7407629179. The cubic root of 12213213 is about 230.2908293260.

Adding to 12213213 its reverse (31231221), we get a palindrome (43444434).

The spelling of 12213213 in words is "twelve million, two hundred thirteen thousand, two hundred thirteen".