Factbox: Key facts about Egypt's Mubarak

(Reuters) - Former Egyptian President Hosni Mubarak, 82, entered hospital on Tuesday, two days after he was summoned to take part in a probe by the public prosecutor.

Here are some key facts about him:

* Mubarak stepped down on February 11 after millions of Egyptians took to the streets to demand he end his 30-year rule. Since then he has been in internal exile in the Red Sea resort of Sharm el-Sheikh, where he spent increasingly large amounts of time during his last years in power.

* The public prosecutor summoned Mubarak on Sunday as part of investigations into the killing of protesters and the embezzlement of public funds. In his first public comments since stepping down, broadcast by Al Arabiya on Sunday, Mubarak denied wrongdoing.

* The former president suffered from health problems in recent years and went to Germany for gall bladder surgery in March 2010.

* Mubarak was thrust into office when Islamists assassinated his predecessor Anwar Sadat at a military parade in 1981. The burly former air force commander proved a far more durable leader than anyone imagined at the time.

* In power, Mubarak promoted Middle East peace and, from 2004, backed economic liberalization measures that delivered sturdy growth but which many ordinary Egyptians blamed for widening the gap between rich and power.

* He always kept a tight lid on political opposition and resisted significant political change, even under pressure from the United States, which has poured billions of dollars of military and other aid into Egypt since it became the first Arab state to make peace with Israel, signing a treaty in 1979.

* Mubarak won the first and only multi-candidate presidential election in 2005, but the outcome was never in doubt and his main rival came a distant second. Rights groups and observers said the election was marred by irregularities, as were all elections during his years in powers.

(Writing by Edmund Blair, editing by Tim Pearce)