Properties of the Number 21275

Twenty-One Thousand Two Hundred Seventy-Five

Basics

Value: 21274 → 21275 → 21276

Parity: odd

Prime: No

Previous Prime: 21269

Next Prime: 21277

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 5 ² × 23 × 37

Divisors: 1, 5, 23, 25, 37, 115, 185, 575, 851, 925

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100011011

Octal: 51433

Duodecimal: 1038B

Hexadecimal: 531b

Square: 452625625

Square Root: 145.8595214581482

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 decagons that can be formed with perimeter n. A288256

Floor(6ⁿ/(1+1/(2·cos(5*π/11)))ⁿ). A240840

Odd numbers k that can be factored to such a pair of coprime factors·and y that A347381(k) < min(A347381(x), A347381(y)). A347390

Positions of 3's in A347381. A347393

Expansion of e.g.f. exp(1 - (1+x)⁵). A369753

The consecutive squares of numbers multiplied by their next consecutive integer. A193608

Odd numbers k such that k/(1+A347381(k)) obtains record values, where A347381 gives the distance from n to the nearest common ancestor of n and σ(n) in the Doudna-tree. A386423

Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f. exp(1 - (1+x)^k). A369738

Decimal expansion of 1/271. A21275