Properties of the Number 21176

Twenty-One Thousand One Hundred Seventy-Six

Basics

Value: 21175 → 21176 → 21177

Parity: even

Prime: No

Previous Prime: 21169

Next Prime: 21179

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ³ × 2647

Divisors: 1, 2, 4, 8, 2647, 5294, 10588, 21176

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001010111000

Octal: 51270

Duodecimal: 10308

Hexadecimal: 52b8

Square: 448422976

Square Root: 145.51975810864997

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(0) = 1; a(n) = (1/n) * ∑_k=1..n binomial(n,k)² * k·4^k-1 * a(n-k). A337594

Number of length n+7 0..1 arrays with at most one downstep in every n consecutive neighbor pairs. A255998

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, 1), (0, 0, 1), (1, 0, -1), (1, 0, 0)}. A150147

Expansion of e.g.f. log(1-log(1-x)). A89064

a(n) = 1482401250·n² - 658736100·n + 73180801. A157798

a(n) = 1482401250·n² - 2793393900·n + 1315947601. A157804

Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the upper median plus the lower median of every 2X2 subblock equal. A236877

Decimal expansion of 1/172. A21176