Properties of the Number 21019

Twenty-One Thousand Nineteen

Basics

Value: 21018 → 21019 → 21020

Parity: odd

Prime: Yes

Previous Prime: 21017

Next Prime: 21023

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 21019

Divisors: 1, 21019

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001000011011

Octal: 51033

Duodecimal: 101B7

Hexadecimal: 521b

Square: 441798361

Square Root: 144.97930886854166

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 obtained from other primes by pre-concatenating with 2. A165243

Last term of prime quadruples. A90258

Primes congruent to 15 mod 59. A142742

Primes p such that p - 2 and p³ - 2 are also prime. A240126

Primes of the form n² - 6. A28880

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

Primes in A105720. A166619

Table read by rows: list of prime 5-tuples of the form (p, p+2, p+6, p+8, p+12). A270998

Greatest prime divisor of A114599(n), or 1 if A114599(n) = 1. A114600

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