Alright, let's work through 63458789 times 21069958 step by step
63458789 × 21069958 = 21069958 × (63458789)
+ 21069958 × 9 giving us 189629622
+ 21069958 × 80 yielding 1685596640
+ 21069958 × 700 giving us 14748970600
+ 21069958 × 8000 that equals 168559664000
+ 21069958 × 50000 giving us 1053497900000
+ 21069958 × 400000 giving us 8427983200000
+ 21069958 × 3000000 resulting in 63209874000000
+ 21069958 × 60000000 yielding 1264197480000000

= 1337074018960862
