Properties of the Number 8421

Eight Thousand Four Hundred Twenty-One

Basics

Value: 8420 → 8421 → 8422

Parity: odd

Prime: No

Previous Prime: 8419

Next Prime: 8423

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 × 401

Divisors: 1, 3, 7, 21, 401, 1203, 2807, 8421

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000011100101

Octal: 20345

Duodecimal: 4A59

Hexadecimal: 20e5

Square: 70913241

Square Root: 91.76600677810929

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) = (20ⁿ - 1)/19. A64108

a(n) = n³ + n² + n + 1. A53698

Triangle of numbers arising in enumeration of walks on cubic lattice. A52179

a(n) is the reverse concatenation of divisors of n. A176558

Number of walks on cubic lattice starting and finishing on the xy plane and never going below it. A5572

a(n) = arrange digits of concatenation of divisors of n (A037278, A176558) in decreasing order (in base 10). A243360

Interprimes (A024675) which are of the form s·prime, s=21. A75296

Triangle of Gaussian binomial coefficients [ n,k ] for q = 20. A22184

Reverse concatenation of distinct digits of all divisors of n in base 10. A256824

Expansion of ∏_k>=1 1 / (1 - 4^k-1*x^k). A338673