Alright, let's work through 90121709 times 18818985 step by step
90121709 × 18818985 = 18818985 × (90121709)
+ 18818985 × 9 what gives us 169370865
+ 18818985 × 00 that results in 0
+ 18818985 × 700 that equals 13173289500
+ 18818985 × 1000 yielding 18818985000
+ 18818985 × 20000 that is equal 376379700000
+ 18818985 × 100000 what gives us 1881898500000
+ 18818985 × 0000000 producing 0
+ 18818985 × 90000000 what gives us 1693708650000000

= 1695999089845365
