What is the next number in this series?

4,12,84,3612....

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

How can you leave a room with two legs and return with six legs?

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

What has no start, end, or centre?

What jumps when it walks and sits when it stands?

In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents the same.Can you place 8 queens on the board in a manner that none of the queens can attack each other?

Decode below rebus
D
N
A
T
S , D