Properties of the Number 66021

Sixty-Six Thousand Twenty-One

Basics

Value: 66020 → 66021 → 66022

Parity: odd

Prime: No

Previous Prime: 65993

Next Prime: 66029

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 59 × 373

Divisors: 1, 3, 59, 177, 373, 1119, 22007, 66021

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000000111100101

Octal: 200745

Duodecimal: 32259

Hexadecimal: 101e5

Square: 4358772441

Square Root: 256.94551951727044

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

Triangle read by rows: T(n,k) is number of (n-k) X k matrices, k=0..n, with nonnegative integer entries and every row and column sum <= 2. A131235

Number of n X (n+1) matrices with nonnegative integer entries and every row and column sum <= 2. A131237

a(n+1) = ∑_{k = 0..floor(2·n/3)} a(k)*a(n-k) for n >= 0 with a(0) = 1. A30033

(a(n)⁶+1)/(n⁶+1) is the smallest integer > 1. A66021