A number as a product of primes
Press 
, type 12210, and press 
: 12'210.. Then 
and the Exp key, 
. The display shows 2×3×5×11×37. The same keys, , , bring the number back: 12'210.. For another number: type 1234567 and press : 1'234'567.. Then , : its factors are 127×(9721). 9721 is in parentheses.