Alright, let's work through 99218509 times 42007633 step by step
99218509 × 42007633 = 42007633 × (99218509)
+ 42007633 × 9 giving us 378068697
+ 42007633 × 00 that is equal 0
+ 42007633 × 500 what gives us 21003816500
+ 42007633 × 8000 what gives us 336061064000
+ 42007633 × 10000 that results in 420076330000
+ 42007633 × 200000 producing 8401526600000
+ 42007633 × 9000000 giving us 378068697000000
+ 42007633 × 90000000 yielding 3780686970000000

= 4167934712879197
