Get number 38,10 from Oracle and it will get truncated (25943)

There is no error message. It is a discrepancy found out by comparing the following:

Inserted a value 0.16810240488058710806053994064187 into a field
defined as NUMBER(22,16)

Here, Oracle should round off the value automatically.

When the field in a simple sql statement in TOAD was selected , <0.
168102404880587> is returned.

<0.1681024048805871> was expected instead; 16 decimal places.

Does TOAD do further rounding/truncation? If yes, how can the precision be controlled or expanded?

When run as a script, try setting the column numwidth like this:

set numwidth 30 <---or whatever number

select * from <table>;

Now press F5