1. The problem is to multiply two large numbers: 79209985234 and 9812409821. 2. The multiplication formula is straightforward: $$a \times b$$ where $a=79209985234$ and $b=9812409821$. 3. Multiply the numbers directly: $$79209985234 \times 9812409821 = 777334927927927011514$$ 4. This is a direct multiplication without any simplification or factorization needed. 5. The final answer is $$777334927927927011514$$.