Actually, 36 - below are the (almost) complete cycles I have (I was thinking of getting rid of some of them, but no one wants classical CDs anymore, so I might as well keep them):
(listed chronologically, with recording dates)
Wilhelm Kempff (Polydor, Grammophon; incomplete, 1925-1936, 1940-1943)
Artur Schnabel (EMI; 1932-1937)
Rudolf Serkin (RCA; incomplete, 1941-1977)
Wilhelm Backhaus (Decca; 1950-1954)
Wilhelm Kempff (DG; 1951-1956)
Walter Gieseking (EMI; incomplete, 1951-1956)
Solomon (EMI; incomplete, 1951-1956)
Yves Nat (EMI; 1953-1955)
Wilhelm Backhaus (Decca; incomplete, 1958-1969)
Claudio Arrau (Philips; 1962-1966)
Sviatoslav Richter (Philips and Melodiya; incomplete, 1963-1992)
Wilhelm Kempff (DG; 1964-1965)
Friedrich Gulda (Amadeo; 1967)
Claude Frank (RCA; 1967-1969)
Éric Heidsieck (EMI; 1967-1973)
Bruce Hungerford (Piano Classics; incomplete, 1967-1976)
Alfred Brendel (Philips; 1971-1978)
Emil Gilels (DG; incomplete, 1972-1985)
Vladimir Ashkenazy (Decca; 1974-1982)
Maurizio Pollini (DG; 1975-2014)
Annie Fischer (Hungaroton, 1977-1978)
Rudolf Buchbinder (Teldec; 1980-1982)
Claudio Arrau (Philips; incomplete, 1984-1990)
Stephen Kovacevich (EMI; 1991-2003)
Alfred Brendel (Philips; 1992-1996)
Richard Goode (Nonesuch; early 1990s)
Andrea Lucchesini (Stradivarius; 1999-2001)
Ronald Brautigam (BIS; 2003-2008)
András Schiff (ECM; 2004-2006)
Daniel Barenboim (Decca; 2005)
Paul Lewis (Harmonia Mundi; 2005-2008)
Jean-Efflam Bavouzet (Chandos; 2008-2014)
François-Frédéric Guy (Zig-Zag Territoires; 2009-2012)
Stewart Goodyear (Marquis; 2010-2012)
Igor Levit (Sony; 2013, 2017-2019)
Konstantin Lifschitz (2017-2019)
Wilhelm Kempff made his first recording of Op.110 in 1936, but I assume you mean his 1951 recording.