Thanos has invaded the Avengers. In the final standoff, Iron Man is off to fight the Mad Titan. Iron Man has created anti-infinity Stones to finish Thanos. But, the anti-Infinity stones can only be used together using a password. Iron Man has created a password of 6 numbers, where each number represents an anti-Infinity Stone.
Iron Man only remembers 5 and has forgotten the 6th. What should be the 6th number so that the billionaire genius can destroy Thanos? The first 5 numbers of the password are: 1210 2020 21200 3211000 42101000
What should be the final number for the password? (Iron Man needs to quickly remember the 6th number, before Thanos figures out the logic behind the password!!!)