Properties of the Number 21311

Twenty-One Thousand Three Hundred Eleven

Basics

Value: 21310 → 21311 → 21312

Parity: odd

Prime: No

Previous Prime: 21283

Next Prime: 21313

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 101 × 211

Divisors: 1, 101, 211, 21311

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001100111111

Octal: 51477

Duodecimal: 103BB

Hexadecimal: 533f

Square: 454158721

Square Root: 145.9828757080775

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

Denominators of continued fraction convergents to sqrt(219). A41409

a(n) = 576·n - 1. A158372

Numbers that eventually reach 1 under "x -> sum of 4th power of digits of x". A219111

Composite numbers whose product of digits is 6. A201055

a(n) is the positive integer·such that 3^(M-1/(2·p)) == -2^x (mod M), where p > 2 is prime, M=2^p-1 is the n-th Mersenne prime and x < p. A278792

Numbers k such that (3^ord(3/2, k) - 2^ord(3/2, k))/k is a prime, where ord(3/2, k) is the multiplicative order of 3/2 (mod k). A345705

Number of (1,2,1)-matching permutations of the prime indices of n. A335446

Number of weakly alternating ordered prime factorizations of n with at least two adjacent equal parts. A349798

Number of (1,2,3)-avoiding permutations of the prime indices of n. A335521

Number of 2n-step lattice paths from (0,0) to (0,0) using steps in {N, S, E, W} starting with East, then always moving straight ahead or turning left. A228248