Properties of the Number 21066

Twenty-One Thousand Sixty-Six

Basics

Value: 21065 → 21066 → 21067

Parity: even

Prime: No

Previous Prime: 21061

Next Prime: 21067

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 3511

Divisors: 1, 2, 3, 6, 3511, 7022, 10533, 21066

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001001001010

Octal: 51112

Duodecimal: 10236

Hexadecimal: 524a

Square: 443776356

Square Root: 145.14131045295133

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 n-gonal inositol homologs with 2 kinds of achiral proligands. A283848

Numbers k such that 2^k mod k = 2^k mod k². A68535

Numbers k that are not powers of 2 such that 2^k mod k = 2^k mod k²; or A068535 with powers of 2 excluded. A125773

Size of the BDD for the hidden weighted bit function, with the variables in their natural ordering. A136445

Numbers k such that the ring of integers of Q(2^1/k) is not Z[2^1/k]. A342390

The number of functions on a finite set that are obtainable by a composition power (excluding identity as power). A163948

Number of inequivalent (rotationally and reflectively distinct) ways to place n nonattacking empresses on n X n board. A218244

Even bisection of A283848. A284711

Total number of colors used in all colored set partitions of [n] where colors of the elements of subsets are distinct and in increasing order and the colors span an initial interval of the color palette. A325930

Integers k equal to the sum over A024816(t) mod t, for some steps, starting with t = k and then using the result to feed the next calculation. A377002