Properties of the Number 21107

Twenty-One Thousand One Hundred Seven

Basics

Value: 21106 → 21107 → 21108

Parity: odd

Prime: Yes

Previous Prime: 21101

Next Prime: 21121

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 21107

Divisors: 1, 21107

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001001110011

Octal: 51163

Duodecimal: 1026B

Hexadecimal: 5273

Square: 445505449

Square Root: 145.2824834589497

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

Discriminants of imaginary quadratic fields with class number 25 (negated). A56987

Number of integer partitions of n whose maximal anti-runs have distinct maxima. A375133

Primes that are the average of the members of emirp pairs. A178581

Prime time primes (of the form HMMSS with primes H < 24 and MM, SS < 60) such that the corresponding number of seconds after midnight is also prime. A295000

Numbers of the form HMMSS with primes H < 24 and MM, SS < 60, for which the number of seconds after midnight, 3600·H+60·MM+SS, is also prime. A295011

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

a(n) = smallest prime > a(n-1) such that a(n)+a(n-1) is multiple of k, a(1)=2, k=101. A178468

Numerators of continued fraction convergents to sqrt(44). A41074

Numerators of continued fraction convergents to sqrt(176). A41324

Primes congruent to 1 mod 61. A212378