Find the next number in the sequence

1, 2, 6, 21, 88, __?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

What goes up but never comes down?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

I am a five-letter word and people eat me. If you remove the first letter I become an energy form. If you remove the first two letters, I am needed to live. Scramble the last three letters and I am a drink. What word am I?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

What does this below rebus puzzle mean?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

A gardener planted the Lemon trees in a mathematical ordered way (i.e. he planted a tree in rows).
He created a total of 19 rows of trees.

Note: There should be more than 2 trees to count as a row.

What is the minimum number of trees required by the gardener to have 19 rows of trees?