integer type in C#

Question

Hello everyone,

1.

C# has integer types, int, int32, int64 and long. In my understanding, int32 is always 32-bit, int64 and long are always 64-bit.

My understanding correct?

2.

How about int? Is it 32-bit or 64-bit or depends on how we build application (build as 32-bit? build as 64-bit or any CPU?)

thanks in advance,
George