Alright, let's work through 25168499 times 84082721 step by step
25168499 × 84082721 = 84082721 × (25168499)
+ 84082721 × 9 yielding 756744489
+ 84082721 × 90 giving us 7567444890
+ 84082721 × 400 what gives us 33633088400
+ 84082721 × 8000 that is equal 672661768000
+ 84082721 × 60000 that is equal 5044963260000
+ 84082721 × 100000 what gives us 8408272100000
+ 84082721 × 5000000 that is equal 420413605000000
+ 84082721 × 20000000 yielding 1681654420000000

= 2116235879405779
