Properties of the Number 21234

Twenty-One Thousand Two Hundred Thirty-Four

Basics

Value: 21233 → 21234 → 21235

Parity: even

Prime: No

Previous Prime: 21227

Next Prime: 21247

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 3539

Divisors: 1, 2, 3, 6, 3539, 7078, 10617, 21234

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001011110010

Octal: 51362

Duodecimal: 10356

Hexadecimal: 52f2

Square: 450882756

Square Root: 145.7189074897283

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

Triangular array formed from successive differences of factorial numbers. A47920

Euler's difference table: triangle read by rows, formed by starting with factorial numbers (A000142) and repeatedly taking differences. T(n,n) = n!, T(n,k) = T(n,k+1) - T(n-1,k). A68106

5th forward differences of factorial numbers A000142. A1689

a(n) = ∑_{i+j+k=n, i,j,k >= 1} τ(i)*τ(j)*τ(k), where τ() = A000005(). A191829

Triangle T[n,m]: T[n,-1] = 0; T[0,0] = 0; T[n,0] = n·n!; T[n,m] = T[n,m-1] - T[n-1,m-1]. A61312

Table T(n,k) giving number of ways of obtaining exactly one correct answer on an (n,k)-matching problem (1 <= k <= n). A76732

Difference triangle of factorial numbers read by upward diagonals. A116853

Fourth column of Euler's difference table in A068106. It is 6 times the sequence A000261. A277609

Triangle of rank k of permutations of {1,2,...,n}. A134830

First differences of the rows in the triangle of A116853, starting with 0. A116854