Can you solve the Leonardo da Vinci riddle Tanya Khovanova

Practice more problemsolving at Solution to Bonus Riddle: Youve found Leonardo da Vincis secret vault, secured by a series of combination locks. Fortunately, your treasure map has three codes: 1210, 3211000, and hmm. The last one appears to be missing. Can you figure out the last number and open the vault Tanya Khovanova shows how. Lesson by Tanya Khovanova, directed by Artrake Studio. Thank you so much to our patrons for your