Properties of the Number 21355

Twenty-One Thousand Three Hundred Fifty-Five

Basics

Value: 21354 → 21355 → 21356

Parity: odd

Prime: No

Previous Prime: 21347

Next Prime: 21377

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 5 × 4271

Divisors: 1, 5, 4271, 21355

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001101101011

Octal: 51553

Duodecimal: 10437

Hexadecimal: 536b

Square: 456036025

Square Root: 146.13350060817677

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

Prefix primes in base 8 (written in base 8). A24768

Coefficient of x² in minimal polynomial of the continued fraction [1ⁿ,2/3,1,1,1,...], where 1ⁿ means n ones. A266704

Number of length 3 1..(n+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal. A254220

a(1) = 1; a(n+1) = floor((sum{k=1 to n} a(k)³)^1/3). A16085

Least n such that n consecutive values in A080378 equal 0; i.e., exactly n differences between consecutive primes are divisible by 4. A80380

First i such that gcd(prime(i)+1, prime(i+1)+1, ..., prime(i+n)+1) > 2. A111038

Decimal expansion of 1/351. A21355