Alright, let's work through 54921993 times 54105642 step by step
54921993 × 54105642 = 54105642 × (54921993)
+ 54105642 × 3 that is equal 162316926
+ 54105642 × 90 producing 4869507780
+ 54105642 × 900 yielding 48695077800
+ 54105642 × 1000 that results in 54105642000
+ 54105642 × 20000 yielding 1082112840000
+ 54105642 × 900000 that equals 48695077800000
+ 54105642 × 4000000 resulting in 216422568000000
+ 54105642 × 50000000 that is equal 2705282100000000

= 2971589691184506
