This is the 803rd most frequent Polish word.
miliardów
"Milardów" means "billions" in English.
'Miliardów' is used here as a quantifier in the genitive case to describe 'ludzi'.
Czterdzieści miliardów ludzi mieszka na Ziemi.
Forty billion people live on Earth.
'Miliardów' is used to describe the amount (in billions) of 'złotych' in a monetary context.
Wydano miliardów złotych na ten projekt.
Billions of zlotys were spent on this project.
'Miliardów' is used to refer to the numeric concept in the context of their significance.