No problem, we've got 21369999 and 78711850 to multiply
21369999 × 78711850 = 78711850 × (21369999)
+ 78711850 × 9 yielding 708406650
+ 78711850 × 90 resulting in 7084066500
+ 78711850 × 900 giving us 70840665000
+ 78711850 × 9000 which equals 708406650000
+ 78711850 × 60000 yielding 4722711000000
+ 78711850 × 300000 that equals 23613555000000
+ 78711850 × 1000000 that equals 78711850000000
+ 78711850 × 20000000 giving us 1574237000000000

= 1682072155788150
