Properties of the Number 21278

Twenty-One Thousand Two Hundred Seventy-Eight

Basics

Value: 21277 → 21278 → 21279

Parity: even

Prime: No

Previous Prime: 21277

Next Prime: 21283

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 × 10639

Divisors: 1, 2, 10639, 21278

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100011110

Octal: 51436

Duodecimal: 10392

Hexadecimal: 531e

Square: 452753284

Square Root: 145.86980496319313

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

Conjectured largest number having n representations as the sum of two twin primes p + q with p >= q. A212613

Monotonic ordering of set S generated by these rules: if·and y are in S then 3xy-x-y is in S, and 2 is in S. A192529

a(n) = (1/3)*n³ - n² - (1/3)*n - 1. A109620

Number of misère-play left dead end games born by day n. A368588

Smallest positive integer not the determinant of an n X n {0,1}-matrix. A13588

Decimal expansion of 1/274. A21278

Index of first occurrence of n in A129363, or 0 if no such number exists. A376287