Properties of the Number 21424

Twenty-One Thousand Four Hundred Twenty-Four

Basics

Value: 21423 → 21424 → 21425

Parity: even

Prime: No

Previous Prime: 21419

Next Prime: 21433

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ⁴ × 13 × 103

Divisors: 1, 2, 4, 8, 13, 16, 26, 52, 103, 104

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001110110000

Octal: 51660

Duodecimal: 10494

Hexadecimal: 53b0

Square: 458987776

Square Root: 146.3693957082559

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

a(n) = n⁵ - (n-1)⁵ + (n-2)⁵ - ... +(-1)ⁿ*0⁵. A62393

Number of partitions of n such that (number parts having multiplicity 1) is not a part and (number of parts > 1) is not a part. A241514

a(n) = A051201(2ⁿ). A78161

Numbers k such that e(k) > 1 and k == e(k) (mod λ(k)), where e(k) = A051903(k) is the maximal exponent in prime factorization of k. A327295

Long legs of the only primitive Pythagorean triple whose inradius is the n-th prime and whose short leg is an odd number. A367573

Numbers k such that σ(k) = ψ(k) + φ(k) + τ(k)². A390421

Number of compositions (ordered partitions) of n into multiplicatively perfect numbers (A007422). A282569

Number of n X 2 0..1 arrays with no 1 equal to more than one of its king-move neighbors, with the exception of exactly one element. A282785

a(n) is the Pisano period of prime(n)². A343116

On a diagonally numbered square grid, with labels starting at 1, this is the number of steps that a (1,n) leaper makes before getting trapped when moving to the lowest available unvisited square, or -1 if it never gets trapped. A352730