Properties of the Number 21032

Twenty-One Thousand Thirty-Two

Basics

Value: 21031 → 21032 → 21033

Parity: even

Prime: No

Previous Prime: 21031

Next Prime: 21059

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 2 ³ × 11 × 239

Divisors: 1, 2, 4, 8, 11, 22, 44, 88, 239, 478

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001000101000

Octal: 51050

Duodecimal: 10208

Hexadecimal: 5228

Square: 442345024

Square Root: 145.0241359222664

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 k such that if x = σ(k) + τ(k) - k then k = σ(x) + τ(x) - x. A238226

Constant term of the reduction by x² -> x+1 of the polynomial p(n,x)=(2x+1)(2x+2)...(2x+n). A192941

Number of square permutations of 2n things. A279200

Numbers k such that sopfr(k) = τ(k)². A305026

Lesser members of dihedral amicable pairs: numbers (m, k) such that t(m) = t(k) = m + k, where t(k) = σ(k) + d(k). A320457

G.f.: (1+x⁴)/(1-x-x⁸). A193942

G.f.: sqrt(1 + 2*∑_n>=1 2ⁿ*x^n²). A227315

a(n) is the number of almost almost unitary polyominoes of size n. An almost almost unitary polyomino is one in which all but 2 of its perimeter walls have length 1. A362709

Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,1,0,3. A37736

Decimal expansion of 1/28. A21032