Properties of the Number 21282

Twenty-One Thousand Two Hundred Eighty-Two

Basics

Value: 21281 → 21282 → 21283

Parity: even

Prime: No

Previous Prime: 21277

Next Prime: 21283

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 3547

Divisors: 1, 2, 3, 6, 3547, 7094, 10641, 21282

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100100010

Octal: 51442

Duodecimal: 10396

Hexadecimal: 5322

Square: 452923524

Square Root: 145.88351517563592

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

Fibonacci sequence beginning 2, 7. A22113

Number of ways to write n as an ordered sum of 9 nonzero triangular numbers. A340954

Numbers which are the sum of their proper divisors containing the digit 4. A59463

Maximal value of ∑_i=1..n (p(i) - p(i+1))², where p(n+1) = p(1), as p ranges over all permutations of {1, 2, ..., n}. A64842

a(0)=2, a(1)=5, a(n+2) = a(n+1) + (-1)ⁿ a(n). A95795

Indices k such that A020507(k)=φ[k](-8) is prime, where φ is a cyclotomic polynomial. A138922

Row sums of the triangle A097883. A98404

Decimal expansion of 1/278. A21282