Alright, let's work through 20966728 times 21360124 step by step
20966728 × 21360124 = 21360124 × (20966728)
+ 21360124 × 8 what gives us 170880992
+ 21360124 × 20 that is equal 427202480
+ 21360124 × 700 that is equal 14952086800
+ 21360124 × 6000 giving us 128160744000
+ 21360124 × 60000 that equals 1281607440000
+ 21360124 × 900000 that results in 19224111600000
+ 21360124 × 0000000 that results in 0
+ 21360124 × 20000000 that equals 427202480000000

= 447851909954272
