No problem, we've got 18987779 and 12315107 to multiply
18987779 × 12315107 = 12315107 × (18987779)
+ 12315107 × 9 producing 110835963
+ 12315107 × 70 what gives us 862057490
+ 12315107 × 700 that results in 8620574900
+ 12315107 × 7000 that results in 86205749000
+ 12315107 × 80000 resulting in 985208560000
+ 12315107 × 900000 that is equal 11083596300000
+ 12315107 × 8000000 yielding 98520856000000
+ 12315107 × 10000000 that results in 123151070000000

= 233836530077353
