The hex color #21e47e is a light color. The web-safe version is Hex
#33CC66. A complementary color is
#DE1B81. The grayscale version is
#818181. A 20% lighter version of the original color is
#54FFB1, and Hex
#00B14B is the 20% darker color. If the color is saturated by 10%, you get
#17EE7E. If the color is desaturated by 10%, the color
#2BDA7E is obtained.