Properties of the Number 21388

Twenty-One Thousand Three Hundred Eighty-Eight

Basics

Value: 21387 → 21388 → 21389

Parity: even

Prime: No

Previous Prime: 21383

Next Prime: 21391

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 ² × 5347

Divisors: 1, 2, 4, 5347, 10694, 21388

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001110001100

Octal: 51614

Duodecimal: 10464

Hexadecimal: 538c

Square: 457446544

Square Root: 146.24636747625564

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 minimal coprime labelings for the complete bipartite graph K_n,n. A213806

Numbers k such that T(k) = T(A072522(k)) + T(A072522(k+1)), T(i) being the triangular numbers. A80824

Decimal expansion of 1/384. A21388