These prefixes from https://en.wikipedia.org/wiki/Template:SI_prefixes(infobox) are not yet supported, but could be added in the file ezunits/ezunits_db.mac:
YC = C*10^24, ZC = C*10^21, EC = C*10^18, PC = C*10^15, TC = C*10^12, hC = C*10^2, daC = C*10, dC = C*10^-1, cC = C*10^-2, aC = C*10^-18, zC = C*10^-21, yC = C*10^-24, YJ = J*10^24, ZJ = J*10^21, EJ = J*10^18, PJ = J*10^15, TJ = J*10^12, hJ = J*10^2, daJ = J*10, dJ = J*10^-1, cJ = J*10^-2, aJ = J*10^-18, zJ = J*10^-21, yJ = J*10^-24, YN = N*10^24, ZN = N*10^21, EN = N*10^18, PN = N*10^15, TN = N*10^12, hN = N*10^2, daN = N*10, dN = N*10^-1, cN = N*10^-2, aN = N*10^-18, zN = N*10^-21, yN = N*10^-24, YPa = Pa*10^24, ZPa = Pa*10^21, EPa = Pa*10^18, PPa = Pa*10^15, TPa = Pa*10^12, hPa = Pa*10^2, daPa = Pa*10, dPa = Pa*10^-1, cPa = Pa*10^-2, aPa = Pa*10^-18, zPa = Pa*10^-21, yPa = Pa*10^-24, YW = W*10^24, ZW = W*10^21, EW = W*10^18, PW = W*10^15, TW = W*10^12, hW = W*10^2, daW = W*10, dW = W*10^-1, cW = W*10^-2, aW = W*10^-18, zW = W*10^-21, yW = W*10^-24, YA = A*10^24, ZA = A*10^21, EA = A*10^18, PA = A*10^15, TA = A*10^12, hA = A*10^2, daA = A*10, dA = A*10^-1, cA = A*10^-2, aA = A*10^-18, zA = A*10^-21, yA = A*10^-24, YdegC = degC*10^24, ZdegC = degC*10^21, EdegC = degC*10^18, PdegC = degC*10^15, TdegC = degC*10^12, GdegC = degC*10^9, MdegC = degC*10^6, kdegC = degC*10^3, hdegC = degC*10^2, dadegC = degC*10, ddegC = degC*10^-1, cdegC = degC*10^-2, mdegC = degC*10^-3, microdegC = degC*10^-6, ndegC = degC*10^-9, pdegC = degC*10^-12, fdegC = degC*10^-15, adegC = degC*10^-18, zdegC = degC*10^-21, ydegC = degC*10^-24, YK = K*10^24, ZK = K*10^21, EK = K*10^18, PK = K*10^15, TK = K*10^12, hK = K*10^2, daK = K*10, dK = K*10^-1, cK = K*10^-2, aK = K*10^-18, zK = K*10^-21, yK = K*10^-24, Yg = g*10^24, Zg = g*10^21, Eg = g*10^18, Pg = g*10^15, Tg = g*10^12, hg = g*10^2, dag = g*10, dg = g*10^-1, cg = g*10^-2, ag = g*10^-18, zg = g*10^-21, yg = g*10^-24, Yl = l*10^24, Zl = l*10^21, El = l*10^18, Pl = l*10^15, Tl = l*10^12, Gl = l*10^9, Ml = l*10^6, kl = l*10^3, hl = l*10^2, dal = l*10, dl = l*10^-1, cl = l*10^-2, ml = l*10^-3, microl = l*10^-6, nl = l*10^-9, pl = l*10^-12, fl = l*10^-15, zl = l*10^-21, yl = l*10^-24, Ym = m*10^24, Zm = m*10^21, Em = m*10^18, Pm = m*10^15, Tm = m*10^12, dam = m*10, dm = m*10^-1, cm = m*10^-2, zm = m*10^-21, ym = m*10^-24, Ys = s*10^24, Zs = s*10^21, Es = s*10^18, Ps = s*10^15, Ts = s*10^12, hs = s*10^2, das = s*10, ds = s*10^-1, cs = s*10^-2, zs = s*10^-21, ys = s*10^-24, YV = V*10^24, ZV = V*10^21, EV = V*10^18, PV = V*10^15, TV = V*10^12, hV = V*10^2, daV = V*10, dV = V*10^-1, cV = V*10^-2, aV = V*10^-18, zV = V*10^-21, yV = V*10^-24, Ymol = mol*10^24, Zmol = mol*10^21, Emol = mol*10^18, Pmol = mol*10^15, Tmol = mol*10^12, hmol = mol*10^2, damol = mol*10, dmol = mol*10^-1, cmol = mol*10^-2, amol = mol*10^-18, zmol = mol*10^-21, ymol = mol*10^-24