What does this rebus riddle means ?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

A little girl goes to the store and buys one dozen eggs. As she is going home, all but three break. How many eggs are left unbroken?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

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?

Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

He took only a few moment and wrote something that fit the requirements. What did he write?

Solve the mathematical equation in the picture below.

A king sentenced a man to the death sentence for some crime he had committed. Known for his kindness, the king told the culprit that he had a choice to die in a way he decides.

The culprit was clever and said something that saved him from death. What method do you think he must have chosen for his death?

Identify the hidden meaning behind this picture?