Properties of the Number 21090

Twenty-One Thousand Ninety

Basics

Value: 21089 → 21090 → 21091

Parity: even

Prime: No

Previous Prime: 21089

Next Prime: 21101

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 5 × 19 × 37

Divisors: 1, 2, 3, 5, 6, 10, 15, 19, 30, 37

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001001100010

Octal: 51142

Duodecimal: 10256

Hexadecimal: 5262

Square: 444788100

Square Root: 145.22396496446444

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

Numbers divisible by prime(d) for each digit d in their base-9 representation, none of which may be zero. A256879

T(n,k) is the number of (n+1) X (k+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 6 (constant-stress 1 X 1 tilings). A235310

Number of simple connected graphs with n nodes rooted at a pair of distinguished vertices. A304074

Consecutive internal states of the linear congruential pseudo-random number generator (171·s + 11213) mod 53125 when started at 1. A385039

Numbers k such that prime(k) +/- k and prime(k) +/- 2k are all primes. A112530

Number of ways to place 2 nonattacking nightriders on an n X n cylindrical board. A196810

Number of (w,x,y) with all terms in {0,...,n} and w < range{w,x,y}. A212967

Number of partitions of n in which any two parts differ by at most 10. A218512

Perimeters of more than one primitive 120-degree integer triangle. A350047

McKay-Thompson series of class 26B for Monster. A58597