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Properties of the Number 21164

Twenty-One Thousand One Hundred Sixty-Four

Basics

Value: 21163 → 21164 → 21165

Parity: even

Prime: No

Previous Prime: 21163

Next Prime: 21169

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 2 × 11 × 13 × 37

Divisors: 1, 2, 4, 11, 13, 22, 26, 37, 44, 52

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 101001010101100

Octal: 51254

Duodecimal: 102B8

Hexadecimal: 52ac

Square: 447914896

Square Root: 145.47852075134665

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

Numbers k such that k and k+1 have 4 distinct prime factors. A140078
Number of nonnegative integer 3 X 3 matrices with sum of elements equal to n, under row and column permutations. A52365
Numbers k such that k and k+1 each have at least 4 distinct prime factors. A321504
Number of 2 X 2 matrices having all elements in {-n,...n} and determinant 4. A209988
Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 307", based on the 5-celled von Neumann neighborhood. A280979
Number of maximum sized subsets of {1..n} such that every pair of distinct elements has a different difference. A382395
Numbers n with property that for each single digit d of n, we can also see the decimal expansion of 2d as a substring of n. Also n may not contain any zero digits. A135016
Number of triangles a queen can make (starting anywhere) on an n X n board. A30117
Indices k where A057176(k) = 2. A86809
Number of 3-step self-avoiding walks on an n X n square summed over all starting positions. A188148