No problem, we've got 2721 and 7858 to multiply
2721 × 7858 = 7858 × (2721)
+ 7858 × 1 what gives us 7858
+ 7858 × 20 yielding 157160
+ 7858 × 700 giving us 5500600
+ 7858 × 2000 what gives us 15716000

= 21381618
