Properties of the Number 21198

Twenty-One Thousand One Hundred Ninety-Eight

Basics

Value: 21197 → 21198 → 21199

Parity: even

Prime: No

Previous Prime: 21193

Next Prime: 21211

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 3533

Divisors: 1, 2, 3, 6, 3533, 7066, 10599, 21198

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001011001110

Octal: 51316

Duodecimal: 10326

Hexadecimal: 52ce

Square: 449355204

Square Root: 145.5953295954235

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 n step self-avoiding walks on 3 X infinity grid starting from (0,1). A7825

G.f. satisfies: A(x) = ∑_n>=0 xⁿ * A(x)ⁿ * (1 + x·A(x)ⁿ)ⁿ. A300043

a(n+3) = -a(n+2) - 2·a(n+1) + a(n) with a(0)=3, a(1)=-1, a(2)=-3. A276228

Numbers n with ω(n) = ω of 3 nearest larger and 3 nearest smaller neighbors. A101936

Numbers n such that n²⁴ + 1 = p·q with p,q distinct primes. A119982

T(1, c) = prime(c). T(r + 1, c) = (T(r, c') + T(r, c'+1)) / 2 where c' is the c-th number such that T(r, c') + T(r, c'+1) is even. Table for T read downwards by antidiagonals. A287943

Decimal expansion of 1/194. A21198

Table read by antidiagonals: T(h,n) is the number of n-step self avoiding walks on a 2D square grid confined to an infinite strip of height 2h where the walk starts at coordinate (0,h). A336988