The 25 most populous countries in the world are (2020 data):
1 China 1,439,323,776 11 Japan 126,476,461
2 India 1,380,004,385 12 Ethiopia 114,963,588
3 United States 331,002,651 13 Philippines 109,581,078
4 Indonesia 273,523,615 14 Egypt 102,334,404
5 Pakistan 220,892,340 15 Vietnam 97,338,579
6 Brazil 212,559,417
7 Nigeria 206,139,589
8 Bangladesh 164,689,383
9 Russia 145,934,462
10 Mexico 128,932,753
16 DR Congo 89,561,403
17 Turkey 84,339,067
18 Iran 83,992,949
19 Germany 83,783,942
20 Thailand 69,799,978
21 United Kingdom 67,886,011
22 France 65,273,511
23 Italy 60,461,826
24 Tanzania 59,734,218
25 South Africa 59,308,690
data taken of Population by Country (2021) - Worldometer (worldometers.info)
Below are vaccination data for those countries.