Properties of the Number 21419

Twenty-One Thousand Four Hundred Nineteen

Basics

Value: 21418 → 21419 → 21420

Parity: odd

Prime: Yes

Previous Prime: 21407

Next Prime: 21433

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 21419

Divisors: 1, 21419

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001110101011

Octal: 51653

Duodecimal: 1048B

Hexadecimal: 53ab

Square: 458773561

Square Root: 146.35231463834114

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

Numbers k such that (12^k + 1)/13 is a prime. A57178

Father primes of order 8. A136077

Primes p such that 2·p + 11 is a square. A269784

Sum of numerator and denominator in a rational approximation j/k of q = log(2)/log(3), such that q - j/k is a new minimum, i.e., q is approximated from below. A355514

a(n) = n*(n² - 1)/2 - 1. A117560

Smaller of two consecutive primes whose product of digits is equal and nonzero. A230083

Sum of numerator and denominator in a rational approximation j/k of q = log(2)/log(3), such that abs(j/k - q) is a new minimum. A355513

Primes of the form : (p-n)/(n+1)=prime and (n+1)*p+n=prime. n=4. A152294

a(1) = 1; thereafter a(n) is always the smallest integer > a(n-1) not leading to a contradiction, such that any five consecutive digits in the sequence sum up to a prime. A152605

Fourth term of weak prime sextet: p(m-2)-p(m-3) < p(m-1)-p(m-2) < p(m)-p(m-1) < p(m+1)-p(m) < p(m+2)-p(m+1). A54831