No problem, we've got 16728248 and 21000557 to multiply
16728248 × 21000557 = 21000557 × (16728248)
+ 21000557 × 8 resulting in 168004456
+ 21000557 × 40 which equals 840022280
+ 21000557 × 200 that equals 4200111400
+ 21000557 × 8000 that results in 168004456000
+ 21000557 × 20000 that equals 420011140000
+ 21000557 × 700000 resulting in 14700389900000
+ 21000557 × 6000000 giving us 126003342000000
+ 21000557 × 10000000 which equals 210005570000000

= 351302525634136
