How to split one text file into multiple *.txt files?

Question

I got a text file file.txt(12 MBs) containing:

something1
something2
something3
something4
(...)

Is there any way to split

Answer 1

If each part have the same lines number, for example 22, here my solution:
split --numeric-suffixes=2 --additional-suffix=.txt -l 22 file.txt file
and you obtain file2.txt with the first 22 lines, file3.txt the 22 next line…

Thank @hamruta-takawale, @dror-s and @stackoverflowuser2010