Properties of the Number 21874

Twenty-One Thousand Eight Hundred Seventy-Four

Basics

Value: 21873 → 21874 → 21875

Parity: even

Prime: No

Previous Prime: 21871

Next Prime: 21881

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 10937

Divisors: 1, 2, 10937, 21874

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010101110010

Octal: 52562

Duodecimal: 107AA

Hexadecimal: 5572

Square: 478471876

Square Root: 147.898613921835

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

Sum of the third largest parts of the partitions of n into 10 squarefree parts. A326635

Expansion of ∏_k>=1 1/(1 - (4·k-1)*x^4·k-1). A265828

Number of palindromic Carlitz compositions of n. A239327

a(n) = M(n) + m(n) for n >= 2, where M(n) = max{ a(i) + a(n-i): i = 1..n-1 }, m(n) = min{ a(i) + a(n-i): i = 1..n-1 }. A22905

a(n) = 625·n - 1. A158374

a(n) = ∑_{(n - k) does not divide n, 0 <= k < n} k². A367327

Table by rows, the number E(n;2) of binary-alphabet topological ε-machines as a function of the number of states n and edges k. A181621

a(n) = 7·5ⁿ-1. A198765

Number of (n+2) X 3 binary arrays avoiding patterns 001 and 110 in rows, columns and nw-to-se diagonals. A202440

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 403", based on the 5-celled von Neumann neighborhood. A271809