Properties of the Number 21131

Twenty-One Thousand One Hundred Thirty-One

Basics

Value: 21130 → 21131 → 21132

Parity: odd

Prime: No

Previous Prime: 21121

Next Prime: 21139

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 11 × 17 × 113

Divisors: 1, 11, 17, 113, 187, 1243, 1921, 21131

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001010001011

Octal: 51213

Duodecimal: 1028B

Hexadecimal: 528b

Square: 446519161

Square Root: 145.36505769957236

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

Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w<x+y. A182260

T(n,k)=Number of nXk 0..1 arrays with no element equal to a strict majority of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. A279134

Unique representation of nonnegative numbers by iterated tribonacci A, B and C sequences. A316713

a(n) is the sum, over all overpartitions of n, of the non-overlined parts. A335651

a(1) = 11 by convention; for n > 1, if n = p^a*q^b... then a(n) = concatenate(p,a,q,b,...). A68633

Numbers that eventually reach 1 under "x -> sum of 4th power of digits of x". A219111

Numbers n such that n¹⁰+10 is prime. A239347

Composite numbers whose product of digits is 6. A201055

Number of nX3 0..1 arrays with no element equal to a strict majority of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. A279129