It is probably worth remembering that Spanish has a specific rule stating that "de" must always appear between "un millón" [or "millones"] and the noun which it is qualifying. Is this mentioned in one of your lessons? ... Does the same rule also apply to "billón"?
Use of "de" after "millón"
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David M. Kwiziq Q&A super contributor
Use of "de" after "millón"
This question relates to:Spanish writing exercise "The longest film in the world"
Asked 1 year ago
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Hola David
Yes, we have an A2 lesson on "large numbers" mentioning this.
I hope it's useful.
Saludos
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