Properties of the Number 21060

Twenty-One Thousand Sixty

Basics

Value: 21059 → 21060 → 21061

Parity: even

Prime: No

Previous Prime: 21059

Next Prime: 21061

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ⁴ × 5 × 13

Divisors: 1, 2, 3, 4, 5, 6, 9, 10, 12, 13

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001001000100

Octal: 51104

Duodecimal: 10230

Hexadecimal: 5244

Square: 443523600

Square Root: 145.12063946937388

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

Triangle T(n,k), 0 <= k <= n, read by rows given by: T(0,0)=1, T(n,k)=0 if k < 0 or if k > n, T(n,0) = T(n-1,1), T(n,k) = T(n-1,k-1) + 3·T(n-1,k) + T(n-1,k+1) for k >= 1. A126970

Sum of the divisors of 12ⁿ+1. A366715

a(n) = ∏_k=0..n (n² + k²). A272244

a(n) = 2·n*(7·n - 3). A316466

Saint-Exupéry numbers: ordered products of the three sides of Pythagorean triangles. A57096

Integers i > 1 for which there is no prime p such that i is a solution mod p of x⁴ = 2. A65903

Numbers n divisible by exactly two nontrivial permutations (rearrangements) of the digits of n. A90057

Numbers with prime factorization pqr^2s^4. A190107

G.f. A(x) satisfies A(x) = 1 + 9·x*A(x)^4/3. A214668

Decimal representation of binary numbers with string structure 10s00, s in {0,1}*, such that it results in a non-palindromic cycle of length 4 in the Reverse and Add! procedure in base 2. A306514