Properties of the Number 21925

Twenty-One Thousand Nine Hundred Twenty-Five

Basics

Value: 21924 → 21925 → 21926

Parity: odd

Prime: No

Previous Prime: 21911

Next Prime: 21929

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 ² × 877

Divisors: 1, 5, 25, 877, 4385, 21925

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010110100101

Octal: 52645

Duodecimal: 10831

Hexadecimal: 55a5

Square: 480705625

Square Root: 148.07092894960846

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) = n³ - n + 1. A61600

Expansion of ∏_k>=1 1/(1 - k·x^k²). A285245

Position of 3ⁿ in A051037 (5-smooth numbers). A188426

Gaps of 6 in sequence A038593 (lower terms). A38651

Braided power sequence: A065692 is b(n+1) = 3·b(n) + 2·d(n) - c(n), this is c(n+1) = 3·c(n) + 2·b(n) - d(n) and A065694 is d(n+1) = 3·d(n) + 2·c(n) - b(n), starting with b(0) = 0, c(0) = 1 and d(0) = 2. A65693

Number of 4 X 4 magic squares with line sum n. A93199

a(n) = 3·a(n-1) - 2·a(n-2) - a(n-4) + a(n-5) with initial terms 1, 1, 1, 3, 6. A196787

The last number for which a determinant of base-n numbers is nonzero. A79505

75-gonal numbers: a(n) = n*(73·n-71)/2. A98230

Quadruple lucky numbers (lower terms). Numbers n such that n, n+2, n+6, n+8 are all Lucky numbers. A139783