No problem, we've got 21438878 and 84260642 to multiply
21438878 × 84260642 = 84260642 × (21438878)
+ 84260642 × 8 what gives us 674085136
+ 84260642 × 70 giving us 5898244940
+ 84260642 × 800 which equals 67408513600
+ 84260642 × 8000 yielding 674085136000
+ 84260642 × 30000 yielding 2527819260000
+ 84260642 × 400000 that results in 33704256800000
+ 84260642 × 1000000 that is equal 84260642000000
+ 84260642 × 20000000 that results in 1685212840000000

= 1806453624039676
