Properties of the Number 21141

Twenty-One Thousand One Hundred Forty-One

Basics

Value: 21140 → 21141 → 21142

Parity: odd

Prime: No

Previous Prime: 21139

Next Prime: 21143

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ⁶ × 29

Divisors: 1, 3, 9, 27, 29, 81, 87, 243, 261, 729

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001010010101

Octal: 51225

Duodecimal: 10299

Hexadecimal: 5295

Square: 446941881

Square Root: 145.3994497926316

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

T(n,k)=Number of nXk 0..2 arrays with every element equal to some element at offset (-1,-1) (-1,0) (-1,1) (0,-1) (0,1) or (1,0) both plus 1 mod 3 and minus 1 mod 3, with new values introduced in order 0..2. A277767

a(n) = (n-1)²*(n+1). A152618

Composite numbers k that divide 3^k - 2^k - 1, excluding powers of 2, 3 and 7. A127073

Values of n such that there are exactly 7 solutions to x² - y² = n with x > y >= 0. A257414

T(n,k)=Number of -k..k arrays of n elements with adjacent element differences also in -k..k. A201042

Numbers of the form HMMSS with primes H < 24 and MM, SS < 60, for which the number of seconds after midnight, 3600·H+60·MM+SS, is also prime. A295011

Numbers m > 1 such that every prime divisor p of m satisfies s_p(m) = p. A324458

Rounded total surface area of a regular dodecahedron with edge length n. A71397

a(n) = 29·n². A244635

Terms k of A228058 for which A048146(k)+A162296(k) >= 2·k, where A048146 is the sum of non-unitary divisors, and A162296 is the sum of divisors that have a square factor. A389219