Why is Pablo Picasso called greatest artist of the 20th century ?

Pablo Diego José Francisco de Paula Juan Nepomuceno María de los Remedios Cipriano de la Santísima Trinidad Ruiz y Picasso (25 October 1881 – 8 April 1973) was a Spanish painter, draughtsman, and sculptor, says Wikipedia.

Commonly known simply as Picasso, he is one of the most recognized figures in 20th-century art. He is best known for co-founding the Cubist movement and for the wide variety of styles embodied in his work. Among his most famous works are the proto-Cubist Les Demoiselles d'Avignon (1907) and Guernica (1937), his portrayal of the German bombing of Guernica during the Spanish Civil War.

Picasso demonstrated uncanny artistic talent in his early years, painting in a realistic manner through his childhood and adolescence; during the first decade of the twentieth century his style changed as he experimented with different theories, techniques, and ideas.

Picasso’s creative genius manifested itself in numerous mediums, including painting, sculpture, drawing, and architecture. His revolutionary artistic accomplishments brought him universal renown and immense fortunes throughout his life, making him the best-known figure in twentieth century art. His fame has continued after his death, firmly establishing his status as one of the greatest artists in Western history.