No problem, we've got 2158 and 7100 to multiply
2158 × 7100 = 7100 × (2158)
+ 7100 × 8 what gives us 56800
+ 7100 × 50 what gives us 355000
+ 7100 × 100 yielding 710000
+ 7100 × 2000 that results in 14200000

= 15321800
