Properties of the Number 21411

Twenty-One Thousand Four Hundred Eleven

Basics

Value: 21410 → 21411 → 21412

Parity: odd

Prime: No

Previous Prime: 21407

Next Prime: 21419

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 13 × 61

Divisors: 1, 3, 9, 13, 27, 39, 61, 117, 183, 351

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001110100011

Octal: 51643

Duodecimal: 10483

Hexadecimal: 53a3

Square: 458430921

Square Root: 146.3249807790864

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

n satisfying σ(n+1) = σ(n-1). A55574

T(n,k) = Number of strings of n+2 numbers x(i) in -k..k with the sum of x(i) equal to zero and the sums of x(i)*x(i+1) and x(i)*x(i+2) equal to each other. A184061

a(n) = n*(14·n + 3). A195025

a(n) = (2·n³ + 5·n² - 7·n)/2. A162261

Least number k such that the determinant of the circulant matrix formed by its decimal digits is equal to k/n. A323485

Numbers k such that σ(k-1) divides σ(k+1). A67130

Numbers n such that σ(n+1) - σ(n-1) = k·n for some integer k, where σ(n) = A000203 (sum of divisors of n). A223137

Numbers k such that σ(k+1) divides σ(k-1). A227304

a(n) is the number of five element sets of distinct integer-sided trapezoids whose base angles are 60 degrees that fill an equilateral triangular grid of side n units. A391498

Numbers whose product of decimal digits equals its sum of binary digits. A64003