Properties of the Number 21295

Twenty-One Thousand Two Hundred Ninety-Five

Basics

Value: 21294 → 21295 → 21296

Parity: odd

Prime: No

Previous Prime: 21283

Next Prime: 21313

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 × 4259

Divisors: 1, 5, 4259, 21295

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100101111

Octal: 51457

Duodecimal: 103A7

Hexadecimal: 532f

Square: 453477025

Square Root: 145.9280644701354

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 240-degree spoke (or ray) of a hexagonal spiral of Ulam. A244805

a(n) = 14·n² + 1. A158482

Bases in which 11 is a unique-period prime. A306076

L.g.f.: ∑_n>=1 (x - x^2·n-1)^2·n-1 / (2·n-1). A293597

Numbers k such that 13 is the largest prime factor of k² - 1. A181451

Numerators of continued fraction convergents to sqrt(154). A41282

Numerators of continued fraction convergents to sqrt(616). A42182

a(n) = 44·n² - 1. A158628

Conjectured lower bounds for the Riemann hypothesis function floor(H(k) + exp(H(k))*log(H(k))) - σ(k). A222761

Integer part of ((4th elementary symmetric function of 1,2,..,n)/(2nd elementary symmetric function of 1,2,...,n)). A24173