Alright, let's work through 54390721 times 52920901 step by step
54390721 × 52920901 = 52920901 × (54390721)
+ 52920901 × 1 resulting in 52920901
+ 52920901 × 20 that equals 1058418020
+ 52920901 × 700 that results in 37044630700
+ 52920901 × 0000 that is equal 0
+ 52920901 × 90000 giving us 4762881090000
+ 52920901 × 300000 giving us 15876270300000
+ 52920901 × 4000000 yielding 211683604000000
+ 52920901 × 50000000 which equals 2646045050000000

= 2878405961359621
