What is the type that sql server assigns to the numeric literal: 2. , i.e. 2 followed by a dot?

I was curious because:

select convert(varchar(50), 2.)
union all
select convert(varchar(50), 2.0)

returns:

2
2.0

which made me ask what's the difference between 2. and 2.0 type wise?

Sql server seems to assign types to numeric literals depending on the number itself by finding the minimal storage type that can hold the number. A value of 1222333 is stored as int while 1152921504606846975 is stored as big int.

thanks