Alright, let's work through 21431810 times 62395457 step by step
21431810 × 62395457 = 62395457 × (21431810)
+ 62395457 × 0 yielding 0
+ 62395457 × 10 that results in 623954570
+ 62395457 × 800 resulting in 49916365600
+ 62395457 × 1000 producing 62395457000
+ 62395457 × 30000 which equals 1871863710000
+ 62395457 × 400000 what gives us 24958182800000
+ 62395457 × 1000000 yielding 62395457000000
+ 62395457 × 20000000 which equals 1247909140000000

= 1337247579287170
