Properties of the Number 21432

Twenty-One Thousand Four Hundred Thirty-Two

Basics

Value: 21431 → 21432 → 21433

Parity: even

Prime: No

Previous Prime: 21419

Next Prime: 21433

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ³ × 3 × 19 × 47

Divisors: 1, 2, 3, 4, 6, 8, 12, 19, 24, 38

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001110111000

Octal: 51670

Duodecimal: 104A0

Hexadecimal: 53b8

Square: 459330624

Square Root: 146.3967212747608

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

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having the sum of the absolute values of the edge differences equal to 6 and no adjacent elements equal. A233733

The number of tilings of an equilateral triangle of side length n with k lozenges and n² - 2·k unit triangles. Triangle T(n, k) with n >= 1 and 0 <= k <= n*(n + 1)/2, read by rows. A273464

Number of possible queen moves on an n X n chessboard. A35005

a(n) = -4·a(n-1) + 6·a(n-2) for n > 1 with a(0) = 1 and a(1) = -6. A152223

a(n) = 82·2ⁿ + 440. A305268

Numbers k such that k!!!!!! - 1 is prime. A51592

Triangle read by rows: T(n,k) is the number of even permutations of {1,2,...,n} with no fixed points and having k excedances (n>=1; k>=1). A145881

a(n)=4·a(n-1)+6·a(n-2), n>1 ; a(0)=1, a(1)=6 . A152224

a(n) = (1/6)*A290911(n). A290912

Number of polycubes of size n and symmetry class C. A376967