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Properties of the Number 21273

Twenty-One Thousand Two Hundred Seventy-Three

Basics

Value: 21272 → 21273 → 21274

Parity: odd

Prime: No

Previous Prime: 21269

Next Prime: 21277

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 × 1013

Divisors: 1, 3, 7, 21, 1013, 3039, 7091, 21273

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001100011001

Octal: 51431

Duodecimal: 10389

Hexadecimal: 5319

Square: 452540529

Square Root: 145.85266538531272

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

a(n) = floor(X/Y) where X = concatenation in decreasing order of (2n)-th even number to (n+1)-th even number and Y = that of first n even numbers in increasing order. A67092
Number of integer partitions of n whose multiplicities have integer median. A360687
a(0) = a(1) = 1. a(n) = a(n-1) + a(n - b(n)), where b(n) is largest prime dividing n. A137809
Number of ways to arrange 5 nonattacking triangular rooks on an n X n X n triangular grid. A193983
Expansion of 1/(1-x3-x4-x5-x6-x7-x8). A17821
Number of (n+2)X(5+2) 0..3 arrays with every consecutive three elements in every row and column not having exactly two distinct values, and in every diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order. A253022
Expansion of 1/((1-2x)(1-4x)(1-6x)(1-7x)). A25965
T(n,k) is the number of ways to arrange k nonattacking triangular rooks on an nXnXn triangular grid. A193986
Primes for which -15 is a primitive root. A105887
Decimal expansion of 1/269. A21273