Properties of the Number 21219

Twenty-One Thousand Two Hundred Nineteen

Basics

Value: 21218 → 21219 → 21220

Parity: odd

Prime: No

Previous Prime: 21211

Next Prime: 21221

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 11 × 643

Divisors: 1, 3, 11, 33, 643, 1929, 7073, 21219

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001011100011

Octal: 51343

Duodecimal: 10343

Hexadecimal: 52e3

Square: 450245961

Square Root: 145.66742944117604

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 that are the sum of 9 nonzero 8th powers. A3387

Numbers that are the sum of 4 positive 9th powers. A3393

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the minimum plus the upper median equal to the lower median plus the maximum in every 2X2 subblock. A235884

Numbers that are the sum of four fourth powers in exactly two ways. A344193

T(n,k)=Unchanging value maps: number of nXk binary arrays indicating the locations of corresponding elements unequal to no king-move neighbor in a random 0..2 nXk array. A219451

Numbers·such that the sum of all their cyclic permutations is equal to that of all cyclic permutations of σ(x) and all cyclic permutations of Euler totient function φ(x). A247317

Round(1000·x), where·is the solution to x = 3^n-x. A103537

Numbers that are the sum of at most 5 positive 9th powers. A4889

Position of cubes in the EKG sequence (A064413). A140418

Numbers of the form x² + y² + z² = φ(x·y*z) + σ(x·y*z). A173792