Alright, let's work through 21719426 times 19528713 step by step
21719426 × 19528713 = 19528713 × (21719426)
+ 19528713 × 6 what gives us 117172278
+ 19528713 × 20 resulting in 390574260
+ 19528713 × 400 producing 7811485200
+ 19528713 × 9000 giving us 175758417000
+ 19528713 × 10000 that results in 195287130000
+ 19528713 × 700000 resulting in 13670099100000
+ 19528713 × 1000000 that equals 19528713000000
+ 19528713 × 20000000 producing 390574260000000

= 424152436878738
