Alright, let's work through 1221 times 3370 step by step
1221 × 3370 = 3370 × (1221)
+ 3370 × 1 what gives us 3370
+ 3370 × 20 producing 67400
+ 3370 × 200 giving us 674000
+ 3370 × 1000 producing 3370000

= 4114770
