Properties of the Number 21230

Twenty-One Thousand Two Hundred Thirty

Basics

Value: 21229 → 21230 → 21231

Parity: even

Prime: No

Previous Prime: 21227

Next Prime: 21247

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 2 × 5 × 11 × 193

Divisors: 1, 2, 5, 10, 11, 22, 55, 110, 193, 386

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001011101110

Octal: 51356

Duodecimal: 10352

Hexadecimal: 52ee

Square: 450712900

Square Root: 145.70518178843196

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

Starts of runs of 3 consecutive tribonacci-Niven numbers (A352089). A352091

Number of equilateral triangles formed by triples of points taken from a hexagonal chunk of side n in the hexagonal lattice. A8893

Expansion of ∏_k>=1 1/(1 - x^k * (1 + k·x)). A336976

Numerators of continued fraction convergents to sqrt(482). A41920

a(n) = number of solutions to the Diophantine equation x+y²+z³=n⁴ with positive x,y,z. A121876

Row sums of A163233 and A163235 divided by 3. A163478

Number of (w,x,y,z) with all terms in {0,...,n} and w=[R/2], where R=max{w,x,y,z}-min{w,x,y,z} and [ ]=floor. A212758

a(n) = 5*(n+1)*(9·n+4). A304507

Number of length n+6 0..1 arrays with at most two downsteps in every n consecutive neighbor pairs. A256821

T(n,k) = Number of length n+k 0..1 arrays with at most two downsteps in every k consecutive neighbor pairs. A256816