Properties of the Number 21225

Twenty-One Thousand Two Hundred Twenty-Five

Basics

Value: 21224 → 21225 → 21226

Parity: odd

Prime: No

Previous Prime: 21221

Next Prime: 21227

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 ² × 283

Divisors: 1, 3, 5, 15, 25, 75, 283, 849, 1415, 4245

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001011101001

Octal: 51351

Duodecimal: 10349

Hexadecimal: 52e9

Square: 450500625

Square Root: 145.68802284333466

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

Sum of 10 positive 9th powers. A3399

Triangle read by rows: DX(n,d) = number of properly d-dimensional polyominoes with n cells, modulo translations (n>=1, 0 <= d <= n-1). A195739

a(n) = 3·2ⁿ + 3ⁿ + 6. A254362

The number of fixed polycubes of size n that span n-4 dimensions. A259015

Number of different n X n symmetric matrices with nonnegative entries summing to 4. Also number of symmetric oriented graphs with 4 arcs on n points. A139594

Third partial sums of ninth powers (A001017). A254643

a(n) = n! * ∑_k=0..n k^3·n/k!. A356688

Number of edge-connected components of polygonal cells in the basketweave tiling up to rotation and reflection of the tiling. A385266

Number of fixed properly-3-dimensional polyominoes with n cells. A6763

Starting positions of strings of three 8's in the decimal expansion of π. A83637