Which type of number is 2.12112111211112 ?

2.12112111211112

An even number - An even number is an integer that is divisible by 2 without a remainder.
An integers - An integer is a whole number (positive, negative, or zero) without any fractional or decimal part. 
A rational number - A rational number can be expressed as a fraction of two integers (where the denominator is not zero). which includes whole numbers, decimals, and fractions as well.
A natural number - A natural number is a positive integer used for counting (1, 2, 3, ...).​​

The number 2.12112111211112 is non-terminating and non-repeating.

We observe that the digits after the decimal point are non-repeating and non-terminating. Hence, from the above properties, the given number is rational.

Thus, the correct answer is (c).