When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Below rebus represent famous DiCaprio movie. Can you name it?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

Imagine you are in a room with no windows or doors. How will you get out?

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

Which point will the car reach to go out?