Alright, let's work through 15704373 times 97820521 step by step
15704373 × 97820521 = 97820521 × (15704373)
+ 97820521 × 3 resulting in 293461563
+ 97820521 × 70 what gives us 6847436470
+ 97820521 × 300 which equals 29346156300
+ 97820521 × 4000 that results in 391282084000
+ 97820521 × 00000 which equals 0
+ 97820521 × 700000 yielding 68474364700000
+ 97820521 × 5000000 that results in 489102605000000
+ 97820521 × 10000000 that is equal 978205210000000

= 1536209948838333
