Properties of the Number -21095

Twenty-One Thousand Ninety-Five

Basics

Value: -21096 → -21095 → -21094

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 5 × 4219

Divisors: 1, 5, 4219, 21095

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101001001100111

Octal: -51147

Duodecimal: -1025B

Hexadecimal: -5267

Square: 444999025

Square Root: 145.24117873385632

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

Number of solutions to c(1)*prime(4) + ... + c(n)*prime(n+3) = 2, where c(i) = +-1 for i > 1, c(1) = 1. A22920

Number of integer partitions of n containing all prime indices of their parts. A324753

Number of function calls of the second kind required to compute ack(3,n), where ack denotes the Ackermann function. A304371

Number of binary words of length n containing at least one subword 10⁶1 and no subwords 10ⁱ1 with i<6. A143286

Triangle read by rows: T(n,k) = A(k,n-k), 1 <= k < n, 2 <= n, where A(m,n) is the number of distinct strings consisting of one X, 2·m Y's and 2·n Z's in which the X lies to the right of at least m Y's and at least n Z's. A351584

Number of (n+2) X 6 0..1 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..1 introduced in row major order. A204377

Numbers n such that numbers 30(n+k) + 1 are prime for k=0..5. A284659