Properties of the Number 21099

Twenty-One Thousand Ninety-Nine

Basics

Value: 21098 → 21099 → 21100

Parity: odd

Prime: No

Previous Prime: 21089

Next Prime: 21101

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 13 × 541

Divisors: 1, 3, 13, 39, 541, 1623, 7033, 21099

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001001101011

Octal: 51153

Duodecimal: 10263

Hexadecimal: 526b

Square: 445167801

Square Root: 145.25494828060076

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

Birooted trees: number of unlabeled trees with n nodes rooted at 2 indistinguishable roots. A303833

Positions of 3's in A234323. A234804

Expansion of g.f.: (1-2·x)/(1-3·x+2·x³). A52948

a(n) is the least number k that is not a quadratic residue modulo prime(n) but is a quadratic residue modulo all previous primes. A377212

Number of asymmetric polyominoes in {4,5} tessellation of the hyperbolic plane. A390191

Group successively larger composite numbers so that the sum of the n-th group is a multiple of n. Sequence gives the sum of the terms in the n-th group. A74120

Least m >= 0 which when added to primorial(n) yields a square. A145781

The number of σ-admissible subsets of {1,2,...,n} as defined by Marzuola-Miller. A158449

Odd 9-gonal (or enneagonal) numbers. A28991

G.f.: ∏_m>0 (1 + x^m + 2·x^2·m + 3·x^3·m). A290269