| Name of Satellite, Alternate Names | Intelsat 21 (IS-21) |
| Country of Operator/Owner | USA |
| Operator/Owner | Intelsat, Ltd. |
| Users | Commercial |
| Purpose | Communications |
| Class of Orbit | GEO |
| Type of Orbit | |
| Longitude of GEO (degrees) | -58 |
| Perigee (km) | 35774 |
| Apogee (km) | 35811 |
| Eccentricity | 0.000438778535428402 |
| Inclination (degrees) | 0.06 |
| Period (minutes) | 1436.39 |
| Launch Mass (kg.) | 5984 |
| Dry Mass (kg.) | 3600 |
| Power (watts) | |
| Date of Launch | 19-08-2012 |
| Expected Lifetime | 15 yrs. |
| Contractor | Boeing Satellite Systems |
| Country of Contractor | USA |
| Launch Site | Sea Launch (Odyssey) |
| Launch Vehicle | Zenit 3SL |
| COSPAR Number | 2012-045A |
| NORAD Number | 38749 |
| Comments | Will replace Intelsat 9 - Meet needs of key customers SKY Mexico, Turner, Discovery,Fox, Telespazio, etc. |