Properties of the Number 21027

Twenty-One Thousand Twenty-Seven

Basics

Value: 21026 → 21027 → 21028

Parity: odd

Prime: No

Previous Prime: 21023

Next Prime: 21031

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 43 × 163

Divisors: 1, 3, 43, 129, 163, 489, 7009, 21027

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001000100011

Octal: 51043

Duodecimal: 10203

Hexadecimal: 5223

Square: 442134729

Square Root: 145.00689638772357

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

a(n) = number of isogeny classes of abelian surfaces over the finite field of order prime(n). A362198

Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and w+x+y>2. A211614

a(0) = 1, a(n) = 25·n² + 2 for n > 0. A10015

Number of binary strings of length n with no substrings equal to 0000 0110 or 1001. A164439

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 926", based on the 5-celled von Neumann neighborhood. A273778

Indices of the primes of |A007442|. A359629

Decimal expansion of 1/23. A21027

Rectangular array pos(i,j,1,2) read by descending antidiagonals: pos( ) and neg() denote the positive part and negative part of a determinant; see Comments. A380660