Properties of the Number 21873

Twenty-One Thousand Eight Hundred Seventy-Three

Basics

Value: 21872 → 21873 → 21874

Parity: odd

Prime: No

Previous Prime: 21871

Next Prime: 21881

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 23 × 317

Divisors: 1, 3, 23, 69, 317, 951, 7291, 21873

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010101110001

Octal: 52561

Duodecimal: 107A9

Hexadecimal: 5571

Square: 478428129

Square Root: 147.895233188903

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 10^k - 3 is prime. A89675

Number of partitions of n into parts not greater than sqrt(n). A97356

a(n) = sum of all divisors of all positive integers <= prime(n). A244583

T(n,k) = Number of n X k 0..4 arrays with no element equal to another at a city block distance of exactly two, and new values 0..4 introduced in row major order. A222944

G.f. A(x) satisfies A(x) = 1 + x·A(x)^3/2 * (1 + A(x)^3/2). A370474

Trajectory of 7 under repeated application of the map in A185452. A185455

The 5x + 1 sequence beginning at 7. A28389

5x + 1 sequence beginning at 11. A259193

Number of n X 2 0..4 arrays with no element equal to another at a city block distance of exactly two, and new values 0..4 introduced in row major order. A222940

Number of length 4 0..n arrays with each partial sum starting from the beginning no more than one standard deviation from its mean. A244792