What two numbers add up to 4010?

There are infinite combinations of two numbers that add up to 4010. Here are some examples using negative numbers:

-1 + 4011 = 4010
-2 + 4012 = 4010
-3 + 4013 = 4010
...

Here are some examples using two fractions that will add up to 4010:

4010/2 + 4010/2 = 4010
8020/3 + 4010/3 = 4010
12030/4 + 4010/4 = 4010
...

And here are some examples using two decimal numbers that will add up to 4010:

1.25 + 4008.75 = 4010
2.50 + 4007.5 = 4010
3.75 + 4006.25 = 4010
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 4010?", it may be more interesting to set some criteria to limit the result. We will set the follow criteria:

1) Only positive whole numbers can add up to 4010. (0 is not a positive or negative number and should not be included.)

2) Since a+b=29 is the same as b+a=29, we should only list it once.

Now, the answer to "What two numbers add up to 4010?" has 2005 answers:

1 + 4009 = 4010
2 + 4008 = 4010
3 + 4007 = 4010
.
.
2003 + 2007 = 4010
2004 + 2006 = 4010
2005 + 2005 = 4010

We have truncated the list above due to space, but you may be interested to know that we calculated the number of answers by dividing 4010 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 4011?
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