Properties

Label 1.421.av
Base Field $\F_{421}$
Dimension $1$
Ordinary Yes
$p$-rank $1$
Principally polarizable Yes
Contains a Jacobian Yes

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Invariants

Base field:  $\F_{421}$
Dimension:  $1$
L-polynomial:  $1 - 21 x + 421 x^{2}$
Frobenius angles:  $\pm0.329001597716$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{-1243}) \)
Galois group:  $C_2$
Jacobians:  4

This isogeny class is simple and geometrically simple.

Newton polygon

This isogeny class is ordinary.

$p$-rank:  $1$
Slopes:  $[0, 1]$

Point counts

This isogeny class contains the Jacobians of 4 curves, and hence is principally polarizable:

Point counts of the abelian variety

$r$ 1 2 3 4 5 6 7 8 9 10
$A(\F_{q^r})$ 401 177643 74635724 31414565763 13225447446101 5567914573268800 2344092096189253601 986862773268828684963 415469227536798147113564 174912544792469569241394403

Point counts of the curve

$r$ 1 2 3 4 5 6 7 8 9 10
$C(\F_{q^r})$ 401 177643 74635724 31414565763 13225447446101 5567914573268800 2344092096189253601 986862773268828684963 415469227536798147113564 174912544792469569241394403

Decomposition and endomorphism algebra

Endomorphism algebra over $\F_{421}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-1243}) \).
All geometric endomorphisms are defined over $\F_{421}$.

Base change

This is a primitive isogeny class.

Twists

Below is a list of all twists of this isogeny class.
TwistExtension DegreeCommon base change
1.421.v$2$(not in LMFDB)