Properties of the Number 21593

Twenty-One Thousand Five Hundred Ninety-Three

Basics

Value: 21592 → 21593 → 21594

Parity: odd

Prime: No

Previous Prime: 21589

Next Prime: 21599

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 11 × 13 × 151

Divisors: 1, 11, 13, 143, 151, 1661, 1963, 21593

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010001011001

Octal: 52131

Duodecimal: 105B5

Hexadecimal: 5459

Square: 466257649

Square Root: 146.94556815365343

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

-7-Knödel numbers. A225511

Array read by antidiagonals: T(n,k) is the number of n X n nonnegative integer matrices with sum of elements equal to k, up to rotations and reflections. A343875

Composite squarefree numbers n such that p(i)-7 divides n+7, where p(i) are the prime factors of n. A225707

Quasi-Carmichael numbers to base 9: squarefree composites n such that (n,2·3*5·7) = 1 and prime p∣n ==> p-9∣n-9. A29554

Numbers k such that 8·10^k + 6·R_k + 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k. A103088

Number of hairpin compositions of n. A338740

n·10⁴-1, n·10⁴-3, n·10⁴-7 and n·10⁴-9 are all prime. A64978

Number of ways to partition a 3·n X 2 grid into 6 connected equal-area regions. A167240

Rectangular table, read by antidiagonals, where the g.f.s of row n, R(x,n), satisfy: R(x,n+1) = R(G(x),n) for n>=0 and x·R(x,0) = G(x) = x + x·G(G(x)) is the g.f. of A030266. A128325

Decimal expansion of 1/589. A21593