As an AI language model, I don't have real-time information or the ability to browse the internet. As of my last knowledge update in September 2021, there was no COVID-19 variant called "COVID-21." However, it's important to note that new variants can emerge over time, and it's best to refer to up-to-date sources such as the World Health Organization (WHO) or the Centers for Disease Control and Prevention (CDC) for the most current information on COVID-19 and its variants.