Decimal to binary conversion for large numbers in Excel

Question

I have some large numbers in an Excel sheet and I want to convert them to binary.

e.g.

12345678  
965321458  
-12457896

Answer 1

There maybe a simple solution. I have several 4.2 billion cells that are actually a negative Two's Complement and this works to get the correct value: =SUM(2^31-(A1-2^31))