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Properties of the Number 21171

Twenty-One Thousand One Hundred Seventy-One

Basics

Value: 21170 → 21171 → 21172

Parity: odd

Prime: No

Previous Prime: 21169

Next Prime: 21179

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 7057

Divisors: 1, 3, 7057, 21171

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001010110011

Octal: 51263

Duodecimal: 10303

Hexadecimal: 52b3

Square: 448211241

Square Root: 145.5025772967613

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

Decimal encoding of the prime factorization of n: concatenation of prime factors and exponents. A67599
T(n,k)=Number of nXk 0..1 arrays with no element equal to more than three of its king-move neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. A281165
Low temperature series for spin-1/2 Ising partition function on 3-dimensional simple cubic lattice. A2891
a(1) = 11 by convention; for n > 1, if n = pa*qb... then a(n) = concatenate(p,a,q,b,...). A68633
Number of compositions of n with at most one 1. A206268
Numbers k such that k and k2 use only the digits 1, 2, 4, 7 and 8. A136997
Number of nX2 0..1 arrays with no element equal to more than three of its king-move neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. A281159
Semiprimes m = p·q where m, p and q are in A033638 (locations of right angle turns in Ulam square spiral). A331997
Least integer k such that the n-th prime of form m2+1 divides the composite number k2+1. A255675
Number of (n+2)X(3+2) 0..2 arrays with every consecutive three elements in every row, column and nw-se diagonal having exactly two distinct values, and new values 0 upwards introduced in row major order. A252947