Alright, let's work through 2638164 times 53921898 step by step
2638164 × 53921898 = 53921898 × (2638164)
+ 53921898 × 4 that is equal 215687592
+ 53921898 × 60 that results in 3235313880
+ 53921898 × 100 which equals 5392189800
+ 53921898 × 8000 that results in 431375184000
+ 53921898 × 30000 that is equal 1617656940000
+ 53921898 × 600000 yielding 32353138800000
+ 53921898 × 2000000 giving us 107843796000000

= 142254810115272
