Properties of the Number 21142

Twenty-One Thousand One Hundred Forty-Two

Basics

Value: 21141 → 21142 → 21143

Parity: even

Prime: No

Previous Prime: 21139

Next Prime: 21143

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 × 11 × 31 ²

Divisors: 1, 2, 11, 22, 31, 62, 341, 682, 961, 1922

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001010010110

Octal: 51226

Duodecimal: 1029A

Hexadecimal: 5296

Square: 446984164

Square Root: 145.40288855452633

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

Variation of Boustrophedon transform applied to all-1's sequence (see Comments for details). A59216

Numbers k that, when expressed in base 5 and then interpreted in base 9, give a multiple of k. A62931

a(n) = 22·n². A195323

The array in A059216 read by antidiagonals in 'up' direction. A59217

a(n) = prime(prime(prime(A028815(n) - 1) - 1) - 1) - 1. A141133

a(n) = self-convolution of row n of array T given by A026536. A27267

Each permutation in the list A060117 converted to Site Swap notation, with digits reversed. "Zero throws" (fixed elements) indicated with 0's. A60496

Number of primitive (aperiodic) word structures of length n using an infinite alphabet. A82951

Expansion of ∏_k>=1 B(x^k), where B(x) is the g.f. of A003114. A327690

Antichain-Chain Quilt Numbers: Square table of the number of ASM quilts of type A₂(j) x C_k read down antidiagonals, where C_k is the chain poset or rank k and A₂(j) is the rank 2 poset with a unique minimal and maximal element and j atoms. A374822