Properties of the Number 21289

Twenty-One Thousand Two Hundred Eighty-Nine

Basics

Value: 21288 → 21289 → 21290

Parity: odd

Prime: No

Previous Prime: 21283

Next Prime: 21313

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 61 × 349

Divisors: 1, 61, 349, 21289

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001100101001

Octal: 51451

Duodecimal: 103A1

Hexadecimal: 5329

Square: 453221521

Square Root: 145.90750494748377

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

Expansion of 1/(1-x²-2·x³). A52947

Numbers k where sin(k) increases monotonically to 1 (or cosec(k) decreases). A46959

Expansion of x²/(1-x²-2·x³). A159287

Expansion of (1 + x)² / ((1 - x² - 2·x³)*(1 + x⁴)). A107849

Odd numbers m that are neither of the form p + 2^k nor of the form p - 2^k with 2^k < m, k >= 1, and p prime. A255967

Consecutive states of the linear congruential pseudo-random number generator 170·s mod 30323 when started at s=1. A385033

Numbers n such that [A070080(n), A070081(n), A070082(n)] is an isosceles integer triangle with integer area. A70145

Expansion of (1-x)/((1-x)² - 4·x³). A97117

Diagonal sums of the Riordan array (1-4·x+4·x², x*(1-2·x)) (A167431). A167434

G.f.: 2·x*(1-x·sqrt(1-4·x))/((1+2·x²+sqrt(1-4·x))*sqrt(1-4·x)). A278023