No problem, we've got 21009426 and 20242137 to multiply
21009426 × 20242137 = 20242137 × (21009426)
+ 20242137 × 6 resulting in 121452822
+ 20242137 × 20 that results in 404842740
+ 20242137 × 400 that results in 8096854800
+ 20242137 × 9000 resulting in 182179233000
+ 20242137 × 00000 resulting in 0
+ 20242137 × 000000 giving us 0
+ 20242137 × 1000000 that results in 20242137000000
+ 20242137 × 20000000 what gives us 404842740000000

= 425275679383362
