The sum of the numbers you provided is:

$400,005,020,200,302 + 1,000,000 = 400,005,021,200,302$

Let me know if you'd like further details or have any questions.

Here are 5 related questions to explore:

1. How would you express this large number in scientific notation?
2. What is the difference between these two numbers?
3. How do you perform addition with large numbers using a calculator?
4. What is the place value of the digit '5' in the number 400,005,021,200,302?
5. How would you subtract 1,000,000 from the original number?

Tip: When adding large numbers, aligning the numbers by place value helps avoid mistakes.