Properties of the Number -2421

Four Hundred Twenty-One

Basics

Value: -2422 → -2421 → -2420

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 269

Divisors: 1, 3, 9, 269, 807, 2421

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100101110101

Octal: -4565

Duodecimal: -1499

Hexadecimal: -975

Square: 5861241

Square Root: 49.20365840057018

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

(n+1)²*a(n+1) = (9n²+9n+3)*a(n) - 27·n²*a(n-1), with a(0) = 1 and a(1) = 3. A6077

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 121", based on the 5-celled von Neumann neighborhood. A270209

(n+1)²*a(n+1) = -(9·n² + 9·n + 3)*a(n) - 27·n²*a(n-1), with a(0) = 1 and a(1) = -3. A291898

Numbers k such that k divides the (right) concatenation of all numbers <= k written in base 25 (most significant digit on right). A29518

Number of partitions of partitions of n where all partitions have the same sum. A305551

Number of compositions (p₁, p₂, p₃, ...) of n with 1 <= p_i <= i for all i. A8930

Numbers k such that 3^k + 4 is prime. A58958

Irregular triangle read by rows where T(n,k) is the number of integer compositions of n with k excedances (parts above the diagonal), all zeros removed. A352524

a(n) = (3·n² + n + 2)/2. A104249

Concentric 22-gonal numbers. A195149