Properties of the Number 22218

Twenty-Two Thousand Two Hundred Eighteen

Basics

Value: 22217 → 22218 → 22219

Parity: even

Prime: No

Previous Prime: 22193

Next Prime: 22229

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 7 × 23 ²

Divisors: 1, 2, 3, 6, 7, 14, 21, 23, 42, 46

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101011011001010

Octal: 53312

Duodecimal: 10A36

Hexadecimal: 56ca

Square: 493639524

Square Root: 149.0570360633808

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

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

Number of ways to write n as an ordered sum of 6 primes (counting 1 as a prime). A341985

Number of step shifted (decimated) sequence structures using a maximum of three different symbols. A56392

a(n) is the area of the rectangle whose edges are n and A375673(n). A375675

Numbers n such that d(n + d(n)) = d(n), where d(n) is the sum of the distinct primes dividing n. A175760

a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (composite numbers), t = (odd natural numbers). A24590

Integer areas A of the integer-sided triangles such that the product of the inradius and the circumradius is a square. A232329

a(0) = 0, a(n) = previous term + repunit of length of previous term for n > 0. A247107

Number of fractions in Farey series of order n. A5728

Gaussian binomial coefficients [ n,11 ] for q = 5. A22218