Alright, let's work through 21020317 times 42459375 step by step
21020317 × 42459375 = 42459375 × (21020317)
+ 42459375 × 7 that equals 297215625
+ 42459375 × 10 which equals 424593750
+ 42459375 × 300 that results in 12737812500
+ 42459375 × 0000 that results in 0
+ 42459375 × 20000 what gives us 849187500000
+ 42459375 × 000000 giving us 0
+ 42459375 × 1000000 yielding 42459375000000
+ 42459375 × 20000000 what gives us 849187500000000

= 892509522121875
