Alright, let's work through 21579803 times 40471926 step by step
21579803 × 40471926 = 40471926 × (21579803)
+ 40471926 × 3 producing 121415778
+ 40471926 × 00 that is equal 0
+ 40471926 × 800 which equals 32377540800
+ 40471926 × 9000 which equals 364247334000
+ 40471926 × 70000 what gives us 2833034820000
+ 40471926 × 500000 that is equal 20235963000000
+ 40471926 × 1000000 yielding 40471926000000
+ 40471926 × 20000000 giving us 809438520000000

= 873376190110578
