Alright, let's work through 21787912 times 84246347 step by step
21787912 × 84246347 = 84246347 × (21787912)
+ 84246347 × 2 producing 168492694
+ 84246347 × 10 giving us 842463470
+ 84246347 × 900 resulting in 75821712300
+ 84246347 × 7000 giving us 589724429000
+ 84246347 × 80000 giving us 6739707760000
+ 84246347 × 700000 that is equal 58972442900000
+ 84246347 × 1000000 what gives us 84246347000000
+ 84246347 × 20000000 that equals 1684926940000000

= 1835551994757464
