What is the next number in this series?

4,12,84,3612....

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

Find the smallest sentence with all the English alphabet.

What is the next number in this matchsticks series riddle?

What has one letter and starts with an E?

I don't get anymore wetter, no matter how much rain falls on me.

Count the number of triangles in the picture below:

Why is the longest human nose just 11 inches?

What has many teeth, but cannot bite?