No problem, we've got 2397 and 8436 to multiply
2397 × 8436 = 8436 × (2397)
+ 8436 × 7 what gives us 59052
+ 8436 × 90 giving us 759240
+ 8436 × 300 yielding 2530800
+ 8436 × 2000 which equals 16872000

= 20221092
