Properties of the Number 21002

Twenty-One Thousand Two

Basics

Value: 21001 → 21002 → 21003

Parity: even

Prime: No

Previous Prime: 21001

Next Prime: 21011

Digit Sum: 5

Digital Root: 5

Palindrome: No

Factorization: 2 × 10501

Divisors: 1, 2, 10501, 21002

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001000001010

Octal: 51012

Duodecimal: 101A2

Hexadecimal: 520a

Square: 441084004

Square Root: 144.9206679531943

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 compositions (ordered partitions) of n into distinct odd parts. A32021

T(n,k) is the number of n element 1..n arrays with each element the minimum of k adjacent elements of a permutation of 1..n+k-1 of n+k-1 elements. A217891

Primes of form 4k+3 written in base 3. A72805

Ceiling(n·exp(sec n)). A134898

Lexicographically earliest strictly increasing base 3 autovarious sequence: a(n) = number of distinct a(k) mod 3ⁿ (written in base 3). A37091

In the list of divisors of n (in base 3), each digit 0-2 appears equally often. A45811

Coefficients in expansion of (q·j(q))^-1/6 where j(q) is the elliptic modular invariant (A000521). A299828

Numbers k such that the continued fraction for sqrt(k) has period 49. A20388

Numbers 3·n + 2 written in base 3. A190642

Not necessarily palindromic primes of which initial and terminal digits are identical, as written in base 3. A231278