Properties of the Number 21190

Twenty-One Thousand One Hundred Ninety

Basics

Value: 21189 → 21190 → 21191

Parity: even

Prime: No

Previous Prime: 21187

Next Prime: 21191

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 5 × 13 × 163

Divisors: 1, 2, 5, 10, 13, 26, 65, 130, 163, 326

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001011000110

Octal: 51306

Duodecimal: 1031A

Hexadecimal: 52c6

Square: 449016100

Square Root: 145.5678535941229

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

Logarithm of e.g.f. for primes. A7447

Number of factorizations with 3 levels of parentheses indexed by prime signatures. A050340(A025487). A50341

Number of Sidon subsets of {1,...,n} of size 6. A241690

Even numbers of the form floor( binomial(2k, 2j)/binomial(k, j)). A111304

Beastly reciprocals, or numbers k such that digitsum(1/k) = 666. A244661

Number n-cyclic graphs. A81809

Number of growing self-avoiding walks with displacement n on a half-infinite strip of height 3 with a trapped endpoint. A374298

Number of nX4 0..1 arrays with every element unequal to 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero. A317218

Decimal expansion of 1/186. A21190