Alright, let's work through 13291121 times 42994401 step by step
13291121 × 42994401 = 42994401 × (13291121)
+ 42994401 × 1 what gives us 42994401
+ 42994401 × 20 producing 859888020
+ 42994401 × 100 resulting in 4299440100
+ 42994401 × 1000 giving us 42994401000
+ 42994401 × 90000 producing 3869496090000
+ 42994401 × 200000 resulting in 8598880200000
+ 42994401 × 3000000 what gives us 128983203000000
+ 42994401 × 10000000 that results in 429944010000000

= 571443786013521
