Arithmetic overflow error converting numeric to data type numeric

Guys

I'm getting the above when trying to populate a variable. The values in question are :
@.N = 21
@.SumXY = -1303765191530058.2251000000
@.SumXSumY = -5338556963168643.7875000000

When I run, SELECT (@.N * @.SumXY) - (@.SumXSumY * @.SumXSumY) in QA I get the result OK which is -28500190448996439680147097583285.072256 ie 32 places to left of decimal and 6 to the right
When I try the following ie to populate a variable with that value I get the error -
SELECT R2Top = (@.N * @.SumXY) - (@.SumXSumY * @.SumXSumY)@.R2Top is NUMERIC (38, 10)

Any ideas ??Sorry - did a typo - problem code is
SELECT @.R2Top = (@.N * @.SumXY) - (@.SumXSumY * @.SumXSumY)
not
SELECT R2Top = (@.N * @.SumXY) - (@.SumXSumY * @.SumXSumY)|||Try:
SELECT R2Top = CAST((@.N * @.SumXY) - (@.SumXSumY * @.SumXSumY) as NUMERIC (38, 10))|||Thanks blindman but still same error.

If I change data type of @.R2Top to FLOAT I get no error but aren't there accuracy issues with FLOAT ? I have further calculations to perform in the code and the accuracy is very important|||What are the datatypes for @.N, @.SumXY, and @.SumXSumY?|||OK. Here is your problem. numeric(38, 10) only leaves you 28 digits to the left of the decimal. Your problem requires 32 digits to the left of the decimal.

This code works:declare @.N int
declare @.SumXY decimal(26, 10)
declare @.SumXSumY decimal(26, 10)
declare @.R2Top numeric(38, 6)

set @.N = 21
set @.SumXY = -1303765191530058.2251000000
set @.SumXSumY = -5338556963168643.7875000000

select @.R2Top = (@.N * @.SumXY) - (@.SumXSumY * @.SumXSumY)
select @.R2Top|||Thanks blindman