GDP of African countries in 2021: Nigeria $429.4 billion Ranked first Sao Tome and Principe $500 million First to last GDP per capita: Seychelles $12,362 Africa was the first to break the 10,000 Burundi is only $272, The lowest country in the world. 2021 African GDP: Nigeria ranks first in Sao Tome and Principe at $500 million in GDP per capita: $12,362 in Seychelles 2021 African GDP: Nigeria ranks first in Sao Tome and Principe at $500 million in GDP per capita: $12,362 in Seychelles 2021 African GDP: Nigeria ranks first in Sao Tome and Principe at $500 million in GDP per capita: $12,362 in Seychelles 2021 African GDP: Nigeria ranks first in Sao Tome and Principe at $500 million in GDP per capita: $12,362 in Seychelles