Properties of the Number 21852

Twenty-One Thousand Eight Hundred Fifty-Two

Basics

Value: 21851 → 21852 → 21853

Parity: even

Prime: No

Previous Prime: 21851

Next Prime: 21859

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ² × 607

Divisors: 1, 2, 3, 4, 6, 9, 12, 18, 36, 607

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010101011100

Octal: 52534

Duodecimal: 10790

Hexadecimal: 555c

Square: 477509904

Square Root: 147.82421993705904

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

Main diagonal of array in A358304, divided by 2. A358307

Sum of numbers in the n-th antidiagonal of the reciprocity array of 0. A259574

First differences of A154570. A156591

a(n) = (4ⁿ + 20)/3. A156605

a(n) = 1458·n - 18. A157508

a(n) = n·prime(prime(n)) - prime(n). A230285

Counterexamples to a conjecture of Ramanujan about congruences related to the partition function. A340757

Lengths of runs of the initial digits of semiprimes in decimal representation, cf. A239634. A239639

Decimal expansion of 1/848. A21852