Alright, let's work through 21268769 times 256478 step by step
21268769 × 256478 = 256478 × (21268769)
+ 256478 × 9 resulting in 2308302
+ 256478 × 60 which equals 15388680
+ 256478 × 700 that results in 179534600
+ 256478 × 8000 what gives us 2051824000
+ 256478 × 60000 yielding 15388680000
+ 256478 × 200000 producing 51295600000
+ 256478 × 1000000 giving us 256478000000
+ 256478 × 20000000 resulting in 5129560000000

= 5454971335582
