Cremona's table of elliptic curves

21440 = 2⁶ · 5 · 67

Field	Data	Notes
Atkin-Lehner	2- 5+ 67+	Signs for the Atkin-Lehner involutions
Class	21440p	Isogeny class
Conductor	21440	Conductor
∏ cp	1	Product of Tamagawa factors cp
deg	8960	Modular degree for the optimal curve
Δ	-5360000000 = -1 · 210 · 57 · 67	Discriminant
Eigenvalues	2-  1 5+ -1  0  2 -6 -4	Hecke eigenvalues for primes up to 20
Equation	[0,1,0,-321,4055]	[a1,a2,a3,a4,a6]
j	-3583365376/5234375	j-invariant
L	1.2210973936578	L(r)(E,1)/r!
Ω	1.2210973936578	Real period
R	1	Regulator
r	0	Rank of the group of rational points
S	1	(Analytic) order of Ш
t	1	Number of elements in the torsion subgroup
Twists	21440f1 5360f1 107200cl1	Quadratic twists by: -4 8 5

Hecke Eigenvalues for elliptic curve 21440p1

a2	a3	a5	a7	a11	a13	a17	a19	a23	a29	a31	a37	a41	a43	a47	a53	a59	a61	a67	a71	a73	a79	a83	a89	a97
-	1	+	-1	0	2	-6	-4	6	-5	4	-4	-10	1	12	-1	7	0	+	-8	8	-10	6	5	-13

---

Quadratic twists for elliptic curve 21440p1

-4	8	5
21440f1	5360f1	107200cl1

---

Data from Elliptic Curve Data by J. E. Cremona.
Design inspired by The Modular Forms Explorer by William Stein.

Part of Computational Number Theory
Back to Tables and computations