Properties of the Number 21493

Twenty-One Thousand Four Hundred Ninety-Three

Basics

Value: 21492 → 21493 → 21494

Parity: odd

Prime: Yes

Previous Prime: 21491

Next Prime: 21499

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 21493

Divisors: 1, 21493

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001111110101

Octal: 51765

Duodecimal: 10531

Hexadecimal: 53f5

Square: 461949049

Square Root: 146.60491124106312

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

Sixth term of strong prime sextets: p(m-4)-p(m-5) > p(m-3)-p(m-4) > p(m-2)-p(m-3) > p(m-1)-p(m-2) > p(m)-p(m-1). A54818

Number of compositions (ordered partitions) of n into distinct parts >= 2. A32022

Primes dividing nonzero terms in A003095: the iterates of x² + 1 starting at 0. A247981

Numbers that are the sum of eight fourth powers in nine or more ways. A345584

Numbers that are the sum of eight fourth powers in exactly nine ways. A345841

Third member of a sexy prime quadruple: value of p+12 such that p, p+6, p+12 and p+18 are all prime. A46123

Primes p such that p+1, p+2 and p+3 have equal number of divisors. A119711

Numbers b > 1 such that the smallest four primes, i.e., 2, 3, 5 and 7 are base-b Wieferich primes. A339533

Primes p such that p+1, p+2, p+3 and p+4 have equal number of divisors. A119728

Primes p such that p+1, p+2, p+3, p+4 and p+5 have equal number of divisors. A119730