Properties of the Number 22221

Twenty-Two Thousand Two Hundred Twenty-One

Basics

Value: 22220 → 22221 → 22222

Parity: odd

Prime: No

Previous Prime: 22193

Next Prime: 22229

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 823

Divisors: 1, 3, 9, 27, 823, 2469, 7407, 22221

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101011011001101

Octal: 53315

Duodecimal: 10A39

Hexadecimal: 56cd

Square: 493772841

Square Root: 149.06709898565813

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

List of co-Lyndon words on {1,2} sorted first by length and then lexicographically. A329318

a(n) = (2·n-1)*(n² -n +6)/6. A49480

Numbers in Morse code, with 1 for a dot, 2 for a dash and 0 between digits/letters. A60109

List of primitive words over the alphabet {1,2}. A213969

a(2n) = a(n), a(2n+1) = 10·a(n) + a(n+1). A178243

For k in {2,3,...,9} define a sequence as follows: a(0)=0; for n>=0, a(n+1)=a(n)+1, unless a(n) ends in k, in which case a(n+1) is obtained by replacing the last digit of a(n) with the digit(s) of k². This is k(4). A237341

Numbers of rank 11 in the poset of lunar numbers. A191753

a(n) = (2·10ⁿ - 11)/9. A165402

Unique representation of nonnegative numbers by iterated tribonacci A, B and C sequences. A316713

Rotating digits of a(n)² right once still yields a square. A45877