Properties of the Number 13021

Thirteen Thousand Twenty-One

Basics

Value: 13020 → 13021 → 13022

Parity: odd

Prime: No

Previous Prime: 13009

Next Prime: 13033

Digit Sum: 7

Digital Root: 7

Palindrome: No

Factorization: 29 × 449

Divisors: 1, 29, 449, 13021

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11001011011101

Octal: 31335

Duodecimal: 7651

Hexadecimal: 32dd

Square: 169546441

Square Root: 114.10959644131601

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Linear 2nd order recurrence: a(n) = 4·a(n-1) + 5·a(n-2). A15531

Numbers whose multiset multisystem (A302242) is crossing. A324170

Pseudoprimes to base 5. A5936

Strong pseudoprimes to base 5. A20231

Dispersion of A047219, (numbers >1 and congruent to 1 or 3 mod 5), by antidiagonals. A191727

Euler pseudoprimes to base 5: composite integers such that abs(5^{(n - 1}/2)) == 1 mod n. A262052

a(n) = n*(31·n-1)/2. A22288

Triangle of q-binomial coefficients for q=-5. A15113

a(n) = (1 - (-5)ⁿ)/6. A14986

Zsigmondy numbers for a = 5, b = 1: Zs(n, 5, 1) is the greatest divisor of 5ⁿ - 1ⁿ (A024049) that is relatively prime to 5^m - 1^m for all positive integers m < n. A64081