Alright, let's work through 3600965 times 20421187 step by step
3600965 × 20421187 = 20421187 × (3600965)
+ 20421187 × 5 yielding 102105935
+ 20421187 × 60 what gives us 1225271220
+ 20421187 × 900 that is equal 18379068300
+ 20421187 × 0000 that results in 0
+ 20421187 × 00000 which equals 0
+ 20421187 × 600000 producing 12252712200000
+ 20421187 × 3000000 that is equal 61263561000000

= 73535979645455
