Properties of the Number -21143

Twenty-One Thousand One Hundred Forty-Three

Basics

Value: -21144 → -21143 → -21142

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 21143

Divisors: 1, 21143

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101001010010111

Octal: -51227

Duodecimal: -1029B

Hexadecimal: -5297

Square: 447026449

Square Root: 145.40632723509663

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

The array in A059216 read by antidiagonals in 'up' direction. A59217

Primes whose decimal representation is a valid number in base 5 and interpreted as such is again a prime. A90708

Numbers k such that (2^k - k)*2^k + 1 is prime. A200816

Prime time primes on 6-digit clocks, second definition: primes of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60. A295013

Number of set partitions of [n] with alternating parity of elements. A274547

Primes of the form p = prime(k+1) such that prime(k) = (prime(k+3)+prime(k-1))/2. A126239

Primes p such that continued fraction of (1 + sqrt(p))/2 has period 16 : primes in A146339. A146361

a(n) = 22·n² + 1. A158537

a(n) is the least number such that d(a(n)) = d(R(a(n)))/n, where R(n) is the digit reverse of n and d(n) is the number of divisors of n. A284495

The prime numbers whose digit sum, adjacent digit sum concatenation, and adjacent digit difference concatenation are also primes. A330653