No, Saturn is known to have more moons than Jupiter, though most of these are tiny moonlets orbiting in Saturn's rings.
As far as is known in mid-2011, that would be Jupiter.
Jupiter has more natural satellites than any other known world.
Jupiter, Saturn and Uranus have MORE that 21 satellites.No planet has just 21 satellites - unless your are reading from a very old text book.
If by planetary satellites you mean Moons, that would be Jupiter with at least 63 confirmed moons - possibly more!
The planet Jupiter, which is the largest planet in the solar system, also has the most moons (which is logical, because the large size of Jupiter means that it also has the strongest gravitational field, and can therefore attract satellites more strongly). All of the four gas giants (Jupiter, Saturn, Uranus, and Neptune) have lots of satellites. The inner planets have fewer satellites.
Jupiter has those, plus at least 48 more satellites.
Earth
Jupiter.
More massive planets have more gravitational pull. If a satellite were to pass by Earth and Jupiter at the same distance from each planet, the satellite would be more attracted to start orbiting Jupiter because of its pull. The more massive a planet is the more likely it is to get a satellite to orbit it.
As of June 2011, Jupiter has 67 confirmed natural satellites, or "moons" orbiting the planet Jupiter. 50 are named moons and 17 have provisional designations based on the year they were first sighted. (see the related question and links)
Jupiter.
NoA more accurate answer:Definition of satellite: A body or object in orbit around another. So by that definition the moon is a satellite of the earthMan made satellites have and do circle other planets also.Go to the Nasa site read about many satellites we have sent Jupiter, Mars etc.