Properties of the Number 21838

Twenty-One Thousand Eight Hundred Thirty-Eight

Basics

Value: 21837 → 21838 → 21839

Parity: even

Prime: No

Previous Prime: 21821

Next Prime: 21839

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 61 × 179

Divisors: 1, 2, 61, 122, 179, 358, 10919, 21838

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010101001110

Octal: 52516

Duodecimal: 1077A

Hexadecimal: 554e

Square: 476898244

Square Root: 147.77685881084358

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

Generalized Jacobsthal numbers. A83579

a(n) = 3·a(n-1) - a(n-2) - 3·a(n-3) + 2·a(n-4). A84172

Triangle read by rows: T(n,k) = 1 + (q-binomial coefficient [n,k] for q=4) - binomial(n,k). A176422

The number of vertices formed by straight line segments mutually connecting all vertices of a semicircular polygon defined in A333642. A330913

(Product of primes <= n) - 2^n-1. A68511

Numbers n such that σ(2*φ(n)) = 2*σ(n). A137733

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (-1, 1, 1), (0, -1, 1), (0, 1, 0), (1, 1, -1)}. A148210

Difference between 2ⁿ and the product of primes less than or equal to n. A319880

Decimal expansion of 1/834. A21838