Properties of the Number 21793

Twenty-One Thousand Seven Hundred Ninety-Three

Basics

Value: 21792 → 21793 → 21794

Parity: odd

Prime: No

Previous Prime: 21787

Next Prime: 21799

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 19 × 31 × 37

Divisors: 1, 19, 31, 37, 589, 703, 1147, 21793

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010100100001

Octal: 52441

Duodecimal: 10741

Hexadecimal: 5521

Square: 474934849

Square Root: 147.62452370795307

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

The Wiener index of a chain of n triangles (i.e., joined like VVV..VV; here V is a triangle!). A143941

Products of three consecutive primes of the form 6n+1 (see A002476). A154728

Number of different words that can be formed from an n X n grid of letters, reading horizontally, vertically or diagonally. A34720

Numerators of minimal squared radii of circular disks covering a record number of lattice points of the hexagonal lattice, when the centers of the circles are chosen to maximize the number of covered lattice points. A346784

Expansion of (1-x)^-1/(1-x-2·x²+x³). A77865

Denominator of ∏_{2 <= p < 2·n} (2·n - p)/p. A84763

Expansion of 1/sqrt(1 - 6x + 17x²). A98339

a(n) = denominator(b(n)), where b(0) = b(1) = 1 and b(n) = n·b(n-1)/b(n-2) for n >= 1. A329813

Non-semiprime composite numbers e such that there is no 0<a<b<c<d<e for which a! * b! * c! * d! * e! is a perfect square. A392333

a(n) = 21·n² - 33·n + 13. A289134