Alright, let's work through 21840351 times 62162187 step by step
21840351 × 62162187 = 62162187 × (21840351)
+ 62162187 × 1 which equals 62162187
+ 62162187 × 50 which equals 3108109350
+ 62162187 × 300 that is equal 18648656100
+ 62162187 × 0000 what gives us 0
+ 62162187 × 40000 producing 2486487480000
+ 62162187 × 800000 yielding 49729749600000
+ 62162187 × 1000000 producing 62162187000000
+ 62162187 × 20000000 what gives us 1243243740000000

= 1357643983007637
