Properties of the Number 21119

Twenty-One Thousand One Hundred Nineteen

Basics

Value: 21118 → 21119 → 21120

Parity: odd

Prime: No

Previous Prime: 21107

Next Prime: 21121

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 7 ² × 431

Divisors: 1, 7, 49, 431, 3017, 21119

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001001111111

Octal: 51177

Duodecimal: 1027B

Hexadecimal: 527f

Square: 446012161

Square Root: 145.32377644418685

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 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

Numbers with 3 or more prime factors (with multiplicity) such that every concatenation of their prime factors is prime. A217264

a(n) = floor(1/(ζ(5) - ∑_h=1..n 1/h⁵)). A248234

Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 369", based on the 5-celled von Neumann neighborhood. A281516

Numbers k > 1 such that k mod ord2(k) is even, where ord2(k) is the order of 2 mod k. A36260

Number of set partitions of {1, ..., n} that avoid 4-crossings. A108305

Regular triangle read by rows where T(n, k) is the number of set partitions of {1, ..., n} with no block containing k cyclically successive vertices, n >= 1, 2 <= k <= n + 1. A323955

Numbers n such that φ(2n-1) = σ(n). A67230

Number of (n+1) X 2 0..1 arrays with the number of rightwards and downwards edge increases in each 2 X 2 subblock equal to the number in all its horizontal and vertical neighbors. A206260

Numbers k such that k!4 + 2⁴ is prime, where k!4 = k!!!! is the quadruple factorial number (A007662). A291344