Properties of the Number -42121

Forty-Two Thousand One Hundred Twenty-One

Basics

Value: -42122 → -42121 → -42120

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 73 × 577

Divisors: 1, 73, 577, 42121

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1010010010001001

Octal: -122211

Duodecimal: -20461

Hexadecimal: -a489

Square: 1774178641

Square Root: 205.23401277566055

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

Expansion of f(-x)¹¹ / f(-x³) + 27·x * f(-x³)¹¹ / f(-x) in powers of·where f() is a Ramanujan θ function. A258724

Composite numbers k of the form 4u+1 for which the odd part of φ(k) divides k-1. A339870

Numbers k such that -3 is a quadratic residue (not necessarily coprime) modulo k, k + 1, k + 2 and k + 3. A318527

Strong pseudoprimes to base 24. A20250

Strong pseudoprimes to base 38. A20264

Strong pseudoprimes to base 54. A20280

Numbers n such that φ(n) = 4*φ(n-1). A268126

Numbers k such that 3^k-1 == 2^k-1 ≠= 1 (mod k). A285300

Least number k such that the concatenation of n consecutive numbers from k to k+n-1 is divisible by their sum. A375728