Alright, let's work through 21610900 times 80340800 step by step
21610900 × 80340800 = 80340800 × (21610900)
+ 80340800 × 0 producing 0
+ 80340800 × 00 that results in 0
+ 80340800 × 900 giving us 72306720000
+ 80340800 × 0000 resulting in 0
+ 80340800 × 10000 that equals 803408000000
+ 80340800 × 600000 resulting in 48204480000000
+ 80340800 × 1000000 that equals 80340800000000
+ 80340800 × 20000000 that is equal 1606816000000000

= 1736236994720000
