Properties of the Number -21161

Twenty-One Thousand One Hundred Sixty-One

Basics

Value: -21162 → -21161 → -21160

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 7 × 3023

Divisors: 1, 7, 3023, 21161

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101001010101001

Octal: -51251

Duodecimal: -102B5

Hexadecimal: -52a9

Square: 447787921

Square Root: 145.46820958546235

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 (s(0),s(1),...,s(n)) such that every s(i) is a nonnegative integer, s(0) = 1, |s(1) - s(0)| = 1, |s(i) - s(i-1)| <= 1 for i >= 2. Also sum of numbers in row n+1 of the array T defined in A026120. A26135

a(n) = 40·n² + 1. A158602

a(n) = n*(7·n² - 3·n - 1)/3. A214659

Smallest numbers containing exactly n smaller numbers when written as English number names. A159453

Numbers whose base-2 representation has exactly 13 runs. A43580

Numbers k such that 189·2^k-1 is prime. A50846

Least semiprime for which n-1 iterations of "Look & Say" (A045918) all yield semiprimes, but not the n-th iteration. A205300

Smallest k such that A257743(k)=n. A257744

Number of partitions of 2·n into exactly n prime powers (including 1). A341154

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 0), (0, -1, 1), (1, 1, -1), (1, 1, 1)}. A149623