There's a reason iPad and iPhone chargers are designed differently. The iPhone's battery capacity is small and requires only 1A of charging current to complete a charge in a reasonable amount of time. Although a larger charging current can greatly shorten the charging time, it will bring more heat, and high temperature is the number one killer of shortening the life of lithium batteries, so the maximum output current of the iPhone charger is designed to be 1A.
The iPad charger is marked with 5V 2.1A, which means that the iPad charger can only output a maximum current of 2.1A. When you use the iPad charger to charge the iPhone, although the iPad charger can provide a maximum current of 2.1A, since the iPhone can only accept 1A current, the iPad charger has to accommodate it. This is like driving on a 4-lane highway. When you encounter a toll booth, only one toll booth is open, so there will be at most one car passing through the toll booth at the same time.
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