12188212 has 6 divisors (see below), whose sum is σ = 21329378. Its totient is φ = 6094104.

The previous prime is 12188191. The next prime is 12188213. The reversal of 12188212 is 21288121.

It can be written as a sum of positive squares in only one way, i.e., 7365796 + 4822416 = 2714^2 + 2196^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12188213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1523523 + ... + 1523530.

Almost surely, 2^12188212 is an apocalyptic number.

It is an amenable number.

12188212 is a deficient number, since it is larger than the sum of its proper divisors (9141166).

12188212 is a wasteful number, since it uses less digits than its factorization.

12188212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047057 (or 3047055 counting only the distinct ones).

The product of its digits is 512, while the sum is 25.

The square root of 12188212 is about 3491.1619842110. The cubic root of 12188212 is about 230.1335833957.

Subtracting 12188212 from its reverse (21288121), we obtain a palindrome (9099909).

The spelling of 12188212 in words is "twelve million, one hundred eighty-eight thousand, two hundred twelve".