Germany, officially the Federal Republic of Germany is a country in Central Europe. The territory of Germany covers 357,021 square kilometers (137,847 sq mi) and is influenced by a temperate seasonal climate. With 81.8 million inhabitants in January 2010, it has the largest population among member states of the European Union, and it is also home to the third-largest number of international migrants worldwide. Germany is a federal parliamentary republic of sixteen states (Länder). The capital and largest city is Berlin. It is a major power with the world's fourth largest economy by nominal GDP and the fifth largest in purchasing power parity.