Alright, let's work through 21245544 times 73613624 step by step
21245544 × 73613624 = 73613624 × (21245544)
+ 73613624 × 4 resulting in 294454496
+ 73613624 × 40 giving us 2944544960
+ 73613624 × 500 which equals 36806812000
+ 73613624 × 5000 that is equal 368068120000
+ 73613624 × 40000 producing 2944544960000
+ 73613624 × 200000 which equals 14722724800000
+ 73613624 × 1000000 producing 73613624000000
+ 73613624 × 20000000 what gives us 1472272480000000

= 1563961487691456
