Properties of the Number 21003

Twenty-One Thousand Three

Basics

Value: 21002 → 21003 → 21004

Parity: odd

Prime: No

Previous Prime: 21001

Next Prime: 21011

Digit Sum: 6

Digital Root: 6

Palindrome: No

Factorization: 3 × 7001

Divisors: 1, 3, 7001, 21003

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001000001011

Octal: 51013

Duodecimal: 101A3

Hexadecimal: 520b

Square: 441126009

Square Root: 144.92411807563295

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

Number of non-isomorphic multiset partitions of weight n with no singletons. A302545

Number of integer partitions of n with no part dividing all the others. A338470

Number of non-isomorphic aperiodic multiset partitions of weight n with no singletons. A320812

Number of directed multigraphs with loops on 4 nodes with n arcs. A50929

Numbers n such that (n+j) mod (2+j) = 1 for j from 0 to 6 and (n+7) mod 9 <> 1. A96025

Convolution of A008619 and A001400. A139672

Number of 7-element subsets of {1, 2, ..., n} having pairwise coprime elements. A186983

Least number·such that xⁿ has n digits equal to k. Case k=4. A285451

Terms as well as digits fit the even/even/odd pattern; this is the lexicographically earliest injective sequence with this property. A375305

Numbers equal to the sum of the aliquot parts of the following k numbers, for some k. A320022