No problem, we've got 821471 and 99420371 to multiply
821471 × 99420371 = 99420371 × (821471)
+ 99420371 × 1 giving us 99420371
+ 99420371 × 70 what gives us 6959425970
+ 99420371 × 400 giving us 39768148400
+ 99420371 × 1000 which equals 99420371000
+ 99420371 × 20000 giving us 1988407420000
+ 99420371 × 800000 resulting in 79536296800000

= 81670951585741
