Properties of the Number 21802

Twenty-One Thousand Eight Hundred Two

Basics

Value: 21801 → 21802 → 21803

Parity: even

Prime: No

Previous Prime: 21799

Next Prime: 21803

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 11 × 991

Divisors: 1, 2, 11, 22, 991, 1982, 10901, 21802

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010100101010

Octal: 52452

Duodecimal: 1074A

Hexadecimal: 552a

Square: 475327204

Square Root: 147.6550033016152

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

List of codewords in binary lexicode with Hamming distance 7 written as decimal numbers. A75937

Expansion of η(q)/η(q⁵)⁵ in powers of q. A109063

Coefficient of·in the reduction by x²->x+1 of the polynomial p(n,x) defined below in Comments. A192756

Number of positive integers with n digits that are equal both to the product of two integers ending with 3 and to that of two integers ending with 7. A348546

a(n) = (1/24)*(n+1)*(n+3)*(n²+22·n+88). A90950

Augmentation of the triangular array |A123191|. See Comments. A193559

a(n) = ∑_k=1..n-1 lcm(lcm(n, k), lcm(n, n-k)). A338798

Numbers whose base-2 representation has exactly 14 runs. A43581

Decimal expansion of 1/798. A21802