This is the 1206th most frequent Spanish word.
tantos
"Tantos" means "so many" or "as many" in English.
Here, 'tantos' is used to express equality in quantity, meaning 'as many as'.
Tengo tantos libros como tú.
I have as many books as you.
In this sentence, 'tantos' denotes a large and indefinite quantity, meaning 'so many'.
Nunca vi tantos pájaros juntos en un lugar.
I have never seen so many birds together in one place.
Here, 'tantos' is used to query about the large number of issues, again meaning 'so many'.