No one wants to have it, but if one got it, he does not want to lose it. What is It?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

What is full of holes but still holds water?

I look at you, you look at me, I raise my right, you raise your left. What am I?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

What is the word or phrase?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

What time is it when an elephant sits on a fence?