Properties of the Number 21271

Twenty-One Thousand Two Hundred Seventy-One

Basics

Value: 21270 → 21271 → 21272

Parity: odd

Prime: No

Previous Prime: 21269

Next Prime: 21277

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 89 × 239

Divisors: 1, 89, 239, 21271

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100010111

Octal: 51427

Duodecimal: 10387

Hexadecimal: 5317

Square: 452455441

Square Root: 145.84580899017976

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 partitions of n into Fibonacci parts (with 2 types of 1). A7000

Number of certain stackings of n+1 squares on a double staircase. A55244

Table read by antidiagonals: Place k equally spaced points on each side of a regular n-gon and join every pair of these n·k points by a chord; T(n,k) (n >= 3, k >= 0) gives the number of vertices in the resulting planar graph. A367302

E.g.f. satisfies A(x) = 1 + A(x)³ * (1 - exp(-x)). A367164

Number of subsets of Z_n such that every ordered pair of distinct elements has a different difference. A382399

Expansion of ∏_k>=1 (1 - k²*x^k)^k. A294581

Numbers k such that k and k² use only the digits 1, 2, 4, 5 and 7. A136989

Number of n X 3 arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 n X 3 array. A219590

Number of zeroless strictly pandigital numbers divisible by the n-th prime. A339498

Bell or exponential numbers: number of ways to partition a set of n labeled elements. A110