12172213 has 4 divisors (see below), whose sum is σ = 12286080. Its totient is φ = 12058348.

The previous prime is 12172189. The next prime is 12172219. The reversal of 12172213 is 31227121.

12172213 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31227121 = 2609 ⋅11969.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12172213 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 (12172219) 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, 56773 + ... + 56986.

It is an arithmetic number, because the mean of its divisors is an integer number (3071520).

Almost surely, 2^12172213 is an apocalyptic number.

It is an amenable number.

12172213 is a deficient number, since it is larger than the sum of its proper divisors (113867).

12172213 is a wasteful number, since it uses less digits than its factorization.

12172213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113866.

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

The square root of 12172213 is about 3488.8698743289. The cubic root of 12172213 is about 230.0328434510.

Adding to 12172213 its reverse (31227121), we get a palindrome (43399334).

It can be divided in two parts, 12 and 172213, that added together give a square (172225 = 415²).

The spelling of 12172213 in words is "twelve million, one hundred seventy-two thousand, two hundred thirteen".