Alright, let's work through 51137613 times 42421066 step by step
51137613 × 42421066 = 42421066 × (51137613)
+ 42421066 × 3 which equals 127263198
+ 42421066 × 10 that results in 424210660
+ 42421066 × 600 giving us 25452639600
+ 42421066 × 7000 that equals 296947462000
+ 42421066 × 30000 resulting in 1272631980000
+ 42421066 × 100000 that results in 4242106600000
+ 42421066 × 1000000 that is equal 42421066000000
+ 42421066 × 50000000 yielding 2121053300000000

= 2169312056155458
