PARI/GP is a computer algebra system designed for fast computations in number theory (factorizations, algebraic number theory, elliptic curves, etc), but also contains a large number of other useful functions to compute with mathematical entities such as matrices, polynomials, power series, algebraic numbers, etc., and a lot of ranscendental functions.
PariDroid is a native Android front-end for the PARI library.
This program is free software, available under terms of the GNU General Public License (v3.0).
CHANGES (v2.0):
* Added settings for configuring real precision and series precision.
* Auto-complete for all PARI functions.