Properties of the Number 16221

Sixteen Thousand Two Hundred Twenty-One

Basics

Value: 16220 → 16221 → 16222

Parity: odd

Prime: No

Previous Prime: 16217

Next Prime: 16223

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 5407

Divisors: 1, 3, 5407, 16221

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 11111101011101

Octal: 37535

Duodecimal: 9479

Hexadecimal: 3f5d

Square: 263120841

Square Root: 127.36168968728391

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 k² and k³ have the same set of digits. A29797

Construct sequences P,Q,R by the rules: Q = first differences of P, R = second differences of P, P starts with 1,3,9, Q starts with 2,6, R starts with 4; at each stage the smallest number not yet present in P,Q,R is appended to R. Sequence gives P. A225385

Number of rationals in [0, 1) consisting just of repeating bits of period at most n. A119917

Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and w+2x+3y>0. A211621

Numbers n such that 2·10ⁿ+11 is prime. A86865

Negative numbers written in a bits-of-π/primorial base system. A109839

Fibonacci sequence beginning 1, 69. A166067

Number of nX6 0..1 arrays with every element equal to 0, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero. A298573

Numbers whose base-4 representation contains exactly three 1's and four 3's. A45128

T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero. A298575