Properties of the Number 21886

Twenty-One Thousand Eight Hundred Eighty-Six

Basics

Value: 21885 → 21886 → 21887

Parity: even

Prime: No

Previous Prime: 21881

Next Prime: 21893

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 × 31 × 353

Divisors: 1, 2, 31, 62, 353, 706, 10943, 21886

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010101111110

Octal: 52576

Duodecimal: 107BA

Hexadecimal: 557e

Square: 478996996

Square Root: 147.9391766909631

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) = floor(sqrt(n!)). A55226

Smallest number whose square has sum of digits A056991(n). A67179

Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + b(n-2) - n, where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences. A294553

Square roots of A068809. A68947

Number of connected labeled 3-colorable (i.e., chromatic number <= 3) graphs on n nodes. A84283

Nearest integer to sqrt( n! ). A55227

Central coefficients of number triangle A119326. A119359

a(0)=1, a(n) = 2·Fibonacci(n+4) - 6. A63758

a(n) is the smallest m for which there appears for the first time a prime p which equals odd part of sum of digits of m². A225430

a(n) = floor(sqrt(n!+1)). A242766