Properties of the Number -17221

Seventeen Thousand Two Hundred Twenty-One

Basics

Value: -17222 → -17221 → -17220

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 17 × 1013

Divisors: 1, 17, 1013, 17221

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100001101000101

Octal: -41505

Duodecimal: -9B71

Hexadecimal: -4345

Square: 296562841

Square Root: 131.2288078129189

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

Expansion of g.f.: 1/(∑_{p odd prime} x^p)² (even powers only). A351317

Centered 20-gonal (or icosagonal) numbers. A69133

Centered 21-gonal numbers. A69178

Number of partitions of n² into squares not less than n. A93116

Expansion of (1 +4·x -x²)/((1-x²)*(1-2·x-x²)); a Pellian-related sequence. A114689

Sequence a(n) = 3·A002559(n) - 2 determining the principal reduced indefinite binary quadratic form [1, a(n), -a(n)] for Markoff triples. A324250

Least m such that if r and s in {1/1, 1/3, 1/6,..., 1/C(n+1,2)} satisfy r < s, then r < k/m < s for some integer k. A24826

Expansion of g.f. (1+4·x)/((1-x)*(1+x)*(1-3·x)). A85287

The number of reversible primes (palindromic or emirps) by increasing permissible leading digit and by length. A220344

Convolution of natural numbers with (1, p(1), p(2), ... ), where p(k) is the k-th prime. A23538