Properties of the Number 21053

Twenty-One Thousand Fifty-Three

Basics

Value: 21052 → 21053 → 21054

Parity: odd

Prime: No

Previous Prime: 21031

Next Prime: 21059

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 37 × 569

Divisors: 1, 37, 569, 21053

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001000111101

Octal: 51075

Duodecimal: 10225

Hexadecimal: 523d

Square: 443228809

Square Root: 145.09651959988565

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

Number of meaningful differential operations of the n-th order on the space R⁹. A90994

Number of nX2 0..1 arrays with every element unequal to 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero. A304013

T(n,k)=Number of nXk 0..1 arrays with every element unequal to 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero. A304019

T(n,k)=Number of nXk 0..1 arrays with every element unequal to 1, 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero. A305367

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

Denominators of continued fraction convergents to sqrt(861). A42663

Number of points of norm <= n in the bi-truncated cubic honeycomb (3-dimensional lattice, with truncated-octahedral cells). A276450

Composite hypotenuses of primitive Pythagorean triangles (A120961) that are not circumdiameters of non-Pythagorean primitive Heronian triangles (A285579). A329148

Molecular topological indices of the pan graphs. A192836

Maximum k such that there are k nonisomorphic n-vertex trees with the same degree sequence. A295637