Find the next number in the series below

21 32 54 87 131 ?

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

How is the moon similar to a dollar?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Can you name some countries which do not have the alphabet 'A' in them?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

Can you solve below mathematical equation?

2^1234 - 2^1233