No problem, we've got 19874017 and 42137617 to multiply
19874017 × 42137617 = 42137617 × (19874017)
+ 42137617 × 7 giving us 294963319
+ 42137617 × 10 giving us 421376170
+ 42137617 × 000 that equals 0
+ 42137617 × 4000 that results in 168550468000
+ 42137617 × 70000 what gives us 2949633190000
+ 42137617 × 800000 that results in 33710093600000
+ 42137617 × 9000000 yielding 379238553000000
+ 42137617 × 10000000 that results in 421376170000000

= 837443716597489
