21104+3215
- Unique Name: 21104+3215SEI1425AB
- RA: 21 10 27.03
- Dec: +32 15 28.2
- Discoverer: SEI
- Discoverer Number: 1425
- Components: AB
- First year: 1894
- Last year: 2012
- Observations: 8
- First position angle: 33
- Last position angle: 34
- First separation: 22.7
- Last separation: 21.4
- Mag first component: 9.34
- Mag second component: 11.76
- Spectral type: G5
- Primary proper motion RA: 3
- Primary proper motion DEC: -3
- Secondary proper motion RA: 0
- Secondary proper motion DEC: -10
- Durchmusterung: +31 4364
- Notes: