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Properties of the Number 21140

Twenty-One Thousand One Hundred Forty

Basics

Value: 21139 → 21140 → 21141

Parity: even

Prime: No

Previous Prime: 21139

Next Prime: 21143

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 2 2 × 5 × 7 × 151

Divisors: 1, 2, 4, 5, 7, 10, 14, 20, 28, 35

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001010010100

Octal: 51224

Duodecimal: 10298

Hexadecimal: 5294

Square: 446899600

Square Root: 145.39601094940673

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 (n+1)X(k+1) 0..3 arrays with every 2X3 or 3X2 subblock having exactly two clockwise edge increases. A206063
a(n) = n3 - n2 - n. A152015
Triangle T(n, k) = Eulerian(n+1, k)*Binomial(n+1, k)/(k+1), read by rows. A155467
Binary "cubes"; numbers whose binary representation consists of three consecutive identical blocks. A297405
Numerators of the convergents given by treating A391217 as continued fraction coefficients after the leading 0. A392258
a(n) = 729·n - 1. A158395
Determinant of n X n matrix of form : [1 2 1 0 0 0 0 0 0 0 / 2 1 2 1 0 0 0 0 0 0 / 1 2 1 2 1 0 0 0 0 0 / 0 1 2 1 2 1 0 0 0 0 / 0 0 1 2 1 2 1 0 0 0 / 0 0 0 1 2 1 2 1 0 0 / 0 0 0 0 1 2 1 2 1 0 / 0 0 0 0 0 1 2 1 2 1 / 0 0 0 0 0 0 1 2 1 2 / 0 0 0 0 0 0 0 1 2 1]. A71534
Number of (n+1)X3 0..3 arrays with every 2X3 or 3X2 subblock having exactly two clockwise edge increases. A206057
Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite EUO = EU-1 Nan[AlnSi112-nO224] starting with a T7 atom. A19126
Number of walks within N3 (the first octant of Z3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (-1, 0, 1), (0, -1, 0), (0, 1, 1), (1, 0, -1)}. A148947