No problem, we've got 9901 and 2130 to multiply
9901 × 2130 = 2130 × (9901)
+ 2130 × 1 that is equal 2130
+ 2130 × 00 what gives us 0
+ 2130 × 900 yielding 1917000
+ 2130 × 9000 resulting in 19170000

= 21089130
