Properties of the Number 21284

Twenty-One Thousand Two Hundred Eighty-Four

Basics

Value: 21283 → 21284 → 21285

Parity: even

Prime: No

Previous Prime: 21283

Next Prime: 21313

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 17 × 313

Divisors: 1, 2, 4, 17, 34, 68, 313, 626, 1252, 5321

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100100100

Octal: 51444

Duodecimal: 10398

Hexadecimal: 5324

Square: 453008656

Square Root: 145.89036979869508

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 generated by a Fibonacci-like sequence in which zeros are suppressed. A243063

Numbers n such that the decimal number concat(5,n) is a square. A273360

Triangle read by rows: T(n,m) (n >= m >= 1) = number of edges in the graph formed by drawing the line segments connecting any two of the (n+1) X (m+1) lattice points in an n X m grid of squares. A333278

Numbers m such that m = p² + k², with p > 0, where p = A007954(m) = the product of digits of m. A334557

Binomial transform of A066247 (characteristic function of composite numbers). A143962

Number of binary strings of length n with no substrings equal to 0001, 0110, or 0111. A164476

Number of -n..n arrays x(0..3) of 4 elements with zero sum and no element more than one greater than the previous. A199848

Numbers k such that 157·2^k+1 is prime. A32455

Expansion of 1/((1-x)(1-2x)(1-9x)(1-10x)). A21284

Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8. A252046