Properties of the Number 21308

Twenty-One Thousand Three Hundred Eight

Basics

Value: 21307 → 21308 → 21309

Parity: even

Prime: No

Previous Prime: 21283

Next Prime: 21313

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 7 × 761

Divisors: 1, 2, 4, 7, 14, 28, 761, 1522, 3044, 5327

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100111100

Octal: 51474

Duodecimal: 103B8

Hexadecimal: 533c

Square: 454030864

Square Root: 145.97260016866178

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

a(n) = 9·n³ - 18·n² + 10·n. A86605

a(n+4) = a(n+1) - a(n), a(0) = 1, a(1) = -4, a(2) = 0, a(3) = 1. A110064

Number of arrays of 4 0..n integers with no sum of consecutive elements equal to a disjoint adjacent sum of an equal number of elements. A215191

Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 5, 6 or 7 king-move adjacent elements, with upper left element zero. A306161

a(1) = 1, a(2) = 2; for n >= 3, a(n) = (n-1)³ - a(n-1) - a(n-2). A361134

Decimal expansion of Rényi's parking constant. A50996

Decimal expansion of 1 - 1/e². A219863

a(n) is the numerator of the probability that n segments of length 2, each placed randomly on a line segment of length 2n, will completely cover the line segment. A231580

Decimal expansion of the fraction of occupied places on an infinite lattice cover with 3-length segments. A307154

Decimal expansion of 1/304. A21308