Properties of the Number 42221

Forty-Two Thousand Two Hundred Twenty-One

Basics

Value: 42220 → 42221 → 42222

Parity: odd

Prime: Yes

Previous Prime: 42209

Next Prime: 42223

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 42221

Divisors: 1, 42221

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1010010011101101

Octal: 122355

Duodecimal: 20525

Hexadecimal: a4ed

Square: 1782612841

Square Root: 205.47749268472205

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

Primes having only {1, 2, 4} as digits. A260267

Prime numbers containing the string 222. A166580

Primes with either no internal digits or all internal digits are 2. A69677

Triangle T(n, k, m) = coefficients of p(x, n, m) where p(x,n,m) = (x+1)*p(x, n-1, m) + 2^m+n-1 *x·p(x, n-2, m) and m=2, read by rows. A154979

First term of weak prime sextet: p(m+1)-p(m) < p(m+2)-p(m+1) < p(m+3)-p(m+2) < p(m+4)-p(m+3) < p(m+5)-p(m+4). A54828

Least early bird number of order n. A133652

Primes that are the sum of 51 consecutive primes. A215992

Primes of the form n²+5·n+c (n>=0), where c=3 for even n and c=-3 for odd n. A117012

Numbers k such that k!6 - 18 is prime, where k!6 is the sextuple factorial number (A085158). A289696

Number of nX4 0..1 arrays with every element equal to 0, 1, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302423