未知数 XYZ is an online mathematics tools platform designed to make numerical and symbolic calculations quick and accessible. Its homepage invites users to enter a natural number and view properties such as primality, factors, prime factorization, number-base conversions, Chinese numeral forms, powers, roots, logarithms, and trigonometric values. The site offers a broad collection of free calculators and reference tools organized across number theory, algebra, geometry, statistics, and computing.

Number-theory features include prime testing, factor lists, greatest common divisors, Euler’s totient function, and tests for special numbers. Algebra tools cover equations, sequences, factorials, derivatives, integrals, logarithms, and expression evaluation. Geometry calculators address areas, volumes, distances, slopes, and coordinates, while statistics tools calculate averages, medians, variance, and standard deviation.

Users can also convert number bases and Roman numerals, and work with matrices, fractions, percentages, and scientific notation. Recent queries are displayed to support quick exploration, and sample numbers help visitors try the calculators. Overall, the platform brings a wide range of practical mathematics utilities together in one browser-based resource