Properties of the Number -212121

Two Hundred Twelve Thousand One Hundred Twenty-One

Basics

Value: -212122 → -212121 → -212120

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 7 ² × 13 × 37

Divisors: 1, 3, 7, 9, 13, 21, 37, 39, 49, 63

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -110011110010011001

Octal: -636231

Duodecimal: -A2909

Hexadecimal: -33c99

Square: 44995318641

Square Root: 460.5659561886875

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 words over {1,2} with equal numbers of 1's and 2's. A214218

a(n) is the smallest number not already present that permits the cyclic repetition of the path 1,2 of the digits in the sequence. A165300

Pseudoprimes to base 6, written in base 6. A262103

Non-primitive words on {1,2,3}. A239018

List of imprimitive words over the alphabet {1,2}. A213972

Unique representation of nonnegative numbers by iterated tribonacci A, B and C sequences. A316713

Shortest (x+1,2x)-code of n. A233135

a(n) = (n in base 10) * (n in base 2). A127906

Triplets: base 10 representation is the juxtaposition of three identical strings. A74842

Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,1. A37495