Properties of the Number -21115

Twenty-One Thousand One Hundred Fifteen

Basics

Value: -21116 → -21115 → -21114

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 5 × 41 × 103

Divisors: 1, 5, 41, 103, 205, 515, 4223, 21115

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101001001111011

Octal: -51173

Duodecimal: -10277

Hexadecimal: -527b

Square: 445843225

Square Root: 145.3100134195851

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 planar cata-polyhexes with n cells. A38142

Partial sums of A000132. A175360

Integer part of γ(n+7/9)/γ(7/9). A20065

Nonprimes whose sum of digits is equal to its product of digits. A66307

Triangular numbers with sum of digits = 10. A68129

Numbers n such that 30n+{11, 13, 17, 19, 23} are 5 consecutive primes. A182279

The intersection of hexagonal numbers (A000384) and centered 9-gonal numbers (A060544). A272399

Expansion of 1/(1+x+2·x²-2·x³). A77977

Hexagonal numbers with prime indices. A117961

Numbers which are both lucky and triangular. A118565