| Official name | EKRAN 21 |
| Alternative name | Ekran-M 21 |
| Cospar ID | 2001-014A |
| Norad ID | 26736 |
| Launch date | 2001-04-07 |
| Launch site | TTMTR |
| Launch vehicle | Proton-M Briz-M (Mod 1) |
| Country/Organization | USSR / Russia |
| Type application | Communication, direct broadcasting |
| Operator | RSCC (Kosmicheskiya Svyaz) |
| RCS size | LARGE |
| Decay date | ON ORBIT |
| Period (min) | 1445.89 |
| Inclination (deg) | 14.31 |
| Perigee (km) | 35850 |
| Apogee (km) | 36106 |
| Eccentricity | 0.00355772972372005 |
| Mean motion (revs. per day) | 0.995926384441417 |
| Semi-Major axis (km) | 42356.135 |
| Raan (deg) | 16.265 |
| Arg of perigee (deg) | 65.6902 |
| Shape | Cyl + 2 Pan + 1 Plate |
| Mass (kg) | 2100 |
| Diameter (m) | 2.5 |
| Height (m) | 5.5 |
| Span (m^2) | 9 |
| Lifetime | 9 years |
| Contractors | NPO Prikladnoi Mekhaniki (NPO PM) |
| Equipment | 1 (+1) UHF 200 W transponder, C-band uplink |
| Configuration | KAUR-3 |
| Power | 2 deployable solar arrays, batteries |
| Satellite | COSPAR | Date | LS | Launch Vehicle | Remarks | |
|---|---|---|---|---|---|---|
| COSMOS 1817 | 1987-010A | 1987-01-30 | TTMTR | Proton-K Blok-DM-2 | ||
| EKRAN 17 | 1987-109A | 1987-12-27 | TTMTR | Proton-K Blok-DM-2 | ||
| EKRAN 19 | 1988-108A | 1988-12-10 | TTMTR | Proton-K Blok-DM-2 | ||
| EKRAN 20 | 1992-074A | 1992-10-30 | TTMTR | Proton-K Blok-DM-2 | ||
| EKRAN 21 | 2001-014A | 2001-04-07 | TTMTR | Proton-M Briz-M (Mod 1) |
.bmp)