Properties of the Number 21193

Twenty-One Thousand One Hundred Ninety-Three

Basics

Value: 21192 → 21193 → 21194

Parity: odd

Prime: Yes

Previous Prime: 21191

Next Prime: 21211

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 21193

Divisors: 1, 21193

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001011001001

Octal: 51311

Duodecimal: 10321

Hexadecimal: 52c9

Square: 449143249

Square Root: 145.57815770231468

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

Class 6+ primes. A81634

Primes p such that the decimal digits of p² can be partitioned into two or more nonzero squares. A48646

Primes p such that 2·prime(p) + 1 = prime(q) for some prime q. A261361

Array: each row starts with the least prime not in a previous row, and each prime p in a row is followed by the greatest prime < 3·p. A229609

a(n) = A119435(2ⁿ). A353035

Twin primes p such that the absolute difference of p and the reverse of its twin is a twin prime. A342216

a(n) is the numerator of ∑_{k = 0..n} fusc(k)/fusc(k+1) (where fusc is Stern's diatomic series A002487). A355075

Let p = prime(σ(n)) and q = prime(φ(n)), then p is in the sequence if p-q = 6. A103176

Numbers k such that k and k² use only the digits 1, 2, 3, 4 and 9. A136972

Primes congruent to 26 mod 61. A142824