Starlight Tools

Starlight Tools directory

Number Theory Calculators

3 free, browser-based tools. No account required.

Explore integer structure, factors, divisibility, and prime decomposition with private browser-based number theory calculators. Start with the Prime Factorization Calculator, Common Factor Calculator, or LCM & GCF Calculator.

Prime factorization calculator listing prime factors and exponents

Prime Factorization Calculator

Find prime factors, exponent form, factor pairs, divisors, a factor tree, and trial-division steps. v1.0

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Common factor calculator showing shared factors and greatest common factor

Common Factor Calculator

List the common factors and greatest common factor of two or more integers with Euclidean steps. v1.0

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LCM and GCF calculator displaying factors and results

LCM & GCF Calculator

Find the least common multiple and greatest common factor using several step-by-step methods. v1.0

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About These Number Theory Calculators

These calculators examine the factors, multiples, divisibility, and prime structure of integers. They provide exact results and explanatory methods suitable for learning, checking work, and computational exploration.