Properties of the Number 21068

Twenty-One Thousand Sixty-Eight

Basics

Value: 21067 → 21068 → 21069

Parity: even

Prime: No

Previous Prime: 21067

Next Prime: 21089

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 23 × 229

Divisors: 1, 2, 4, 23, 46, 92, 229, 458, 916, 5267

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 101001001001100

Octal: 51114

Duodecimal: 10238

Hexadecimal: 524c

Square: 443860624

Square Root: 145.1482001266292

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

Numbers n such that Bernoulli number B_n has denominator 1410. A272369

T(n,k)=Number of (n+1)X(k+1) binary arrays with each element of every 2X2 subblock being the sum mod 2 of two others. A183845

Irregular array T(n,k) of the numbers of non-extendable (complete) non-self-adjacent simple paths ending at each of a minimal subset of nodes within a square lattice bounded by rectangles with nodal dimensions n and 6, n >= 2. A213070

Numbers·such that there exist three integers 0<x<=y, z>0 and w>0 such that σ(x)³ = σ(y)³ = x³ + y³ + z³ + w³. A385397

Irregular array T(n,k) of the numbers of non-extendable (complete) non-self-adjacent simple paths ending at each of a minimal subset of nodes within a square lattice bounded by rectangles with nodal dimensions n and 7, n >= 2. A214373

p-INVERT of (1,0,0,1,0,0,1,0,0,...), where p(S) = (1 - S)². A289919

Number of (n+1) X 4 binary arrays with each element of every 2 X 2 subblock being the sum mod 2 of two others. A183839

Number of (n+1)X5 binary arrays with each element of every 2X2 subblock being the sum mod 2 of two others. A183840

Number of (n+3) X 8 0..2 matrices with each 4 X 4 subblock idempotent. A224725

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000101. A259768