Properties of the Number 21069

Twenty-One Thousand Sixty-Nine

Basics

Value: 21068 → 21069 → 21070

Parity: odd

Prime: No

Previous Prime: 21067

Next Prime: 21089

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 2341

Divisors: 1, 3, 9, 2341, 7023, 21069

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001001001101

Octal: 51115

Duodecimal: 10239

Hexadecimal: 524d

Square: 443902761

Square Root: 145.15164484083533

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

Number of integer partitions of n whose distinct parts have integer median. A360686

Row sums of the array A274193, defined by g(n,k) = 1 for n >= 0; g(n,k) = 0 if k > n; g(n,k) = g(n-1,k-1) + g(n-1,3k) for n > 0, k > 1. A274194

A coefficient tree from the list partition transform relating A111884, A084358, A000262, A094587, A128229 and A131758. A131202

a(n) = ∑_{1 <= x₁, x₂, x₃ <= n} gcd(x₁, x₂, n)/gcd(x₁, x₂, x₃, n). A373061

Base-8 palindromes that start with 5. A43025

Decimal expansion of 1/65. A21069