54.21 centimeters is equivalent to 21.34 inches.
Compared to a commonly used household item, 21.34 inches is approximately the length of a standard computer keyboard, which typically measures around 21 inches.
In terms of smaller objects, 21.34 inches is slightly longer than a standard ruler (12 inches) and approximately the same length as a legal size sheet of paper (8.5 x 14 inches).
Compared to larger objects, 21.34 inches is slightly shorter than the height of a standard kitchen countertop (typically 36 inches) and significantly shorter than the width of a queen-sized bed (60 inches).