No problem, we've got 84234269 and 61821137 to multiply
84234269 × 61821137 = 61821137 × (84234269)
+ 61821137 × 9 what gives us 556390233
+ 61821137 × 60 giving us 3709268220
+ 61821137 × 200 that equals 12364227400
+ 61821137 × 4000 what gives us 247284548000
+ 61821137 × 30000 what gives us 1854634110000
+ 61821137 × 200000 that results in 12364227400000
+ 61821137 × 4000000 resulting in 247284548000000
+ 61821137 × 80000000 which equals 4945690960000000

= 5207458283943853
