Properties of the Number 21094

Twenty-One Thousand Ninety-Four

Basics

Value: 21093 → 21094 → 21095

Parity: even

Prime: No

Previous Prime: 21089

Next Prime: 21101

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 × 53 × 199

Divisors: 1, 2, 53, 106, 199, 398, 10547, 21094

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001001100110

Octal: 51146

Duodecimal: 1025A

Hexadecimal: 5266

Square: 444956836

Square Root: 145.23773614319387

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 primitive (period n) periodic palindromic structures using exactly four different symbols. A56521

p-INVERT of A175676 (starting at n=3), where p(S) = 1 - S - S². A289844

Upper midsequence of the Fibonacci numbers (1,2,3,5,8,...) and Lucas numbers (1,3,4,7,11,...); see Comments. A355325

Sum of first n 7-almost primes. A86059

Expansion of (1 - x)*(1 + 2·x) / ((1 + x)*(1 - 4·x - x²)). A102129

Numbers n such that σ(n) and σ(σ(n)) are both perfect squares. A134263

Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 5 X 5 X 5 subtriangle summing to 14. A154090

Triangle, read by rows, given by [0,1,1,1,1,1,1,1,...] δ [1,0,1,0,2,0,3,0,4,0,5,0,6,0,...] where δ is the operator defined in A084938. A173050

Irregular triangle read by rows: T(n,k) is the number of primitive (period n) periodic palindromic structures using exactly k different symbols, 1 <= k <= n/2 + 1. A285037

Expansion of 1/((1-x)*(1-2·x)*(1-4·x)*(1-11·x)). A21094