one USD is about 362 Zimbabwean dollars. So it would still be about ~53 trillion dollars which is more than the nominal GDP of US and China combined.
Zimbabwe redenominated its currency three times in 2006, 2008, and 2009, dropping a total of 25 trailing zeros in the process. the 4th Zimbabwean dollar in 2009 was worth 10^25 of the first zimbabwean dollar.