12128212 has 12 divisors (see below), whose sum is σ = 21419860. Its totient is φ = 6008256.

The previous prime is 12128189. The next prime is 12128219. The reversal of 12128212 is 21282121.

It can be written as a sum of positive squares in 2 ways, for example, as 7650756 + 4477456 = 2766^2 + 2116^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12128212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12128219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13473 + ... + 14344.

Almost surely, 2^12128212 is an apocalyptic number.

It is an amenable number.

12128212 is a deficient number, since it is larger than the sum of its proper divisors (9291648).

12128212 is a wasteful number, since it uses less digits than its factorization.

12128212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27930 (or 27928 counting only the distinct ones).

The product of its digits is 128, while the sum is 19.

The square root of 12128212 is about 3482.5582550763. The cubic root of 12128212 is about 229.7553289764.

The spelling of 12128212 in words is "twelve million, one hundred twenty-eight thousand, two hundred twelve".