Alright, let's work through 2120 times 9900 step by step
2120 × 9900 = 9900 × (2120)
+ 9900 × 0 that is equal 0
+ 9900 × 20 producing 198000
+ 9900 × 100 that is equal 990000
+ 9900 × 2000 giving us 19800000

= 20988000
