Area code "21" is used to dial to the following cities:

  • Algeria - Algiers
  • Brazil - Rio de Janeiro - Niteroi
  • Brazil - Rio de Janeiro - Rio De Janeiro
  • China - Shanghai Municipality - Shanghai
  • Greece - Athens
  • Indonesia - Java - Jakarta
  • Iran - Tehran
  • Ireland - Cork
  • Laos - Vientiane
  • Libya - Tripoli
  • Mozambique - Maputo

  • Pakistan - Karachi
  • Paraguay - Asuncion
  • Portugal - Amadora
  • Portugal - Cascais
  • Portugal - Lisbon
  • Portugal - Loures
  • Romania - Bucharest
  • South Africa - Atlantis
  • South Africa - Bellville
  • South Africa - Cape Town
  • South Africa - Franschhoek
  • South Africa - Grabouw
  • South Africa - Paarl
  • South Africa - Somerset West
  • South Africa - Stellenbosch
  • South Africa - Strand
  • Sweden - Vasteras
  • Switzerland - Lausanne
  • Syria - Aleppo