Alright, let's work through 18004292 times 19921539 step by step
18004292 × 19921539 = 19921539 × (18004292)
+ 19921539 × 2 that equals 39843078
+ 19921539 × 90 yielding 1792938510
+ 19921539 × 200 what gives us 3984307800
+ 19921539 × 4000 producing 79686156000
+ 19921539 × 00000 that equals 0
+ 19921539 × 000000 that equals 0
+ 19921539 × 8000000 that equals 159372312000000
+ 19921539 × 10000000 producing 199215390000000

= 358673205245388
