Properties of the Number 21332

Twenty-One Thousand Three Hundred Thirty-Two

Basics

Value: 21331 → 21332 → 21333

Parity: even

Prime: No

Previous Prime: 21323

Next Prime: 21341

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5333

Divisors: 1, 2, 4, 5333, 10666, 21332

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001101010100

Octal: 51524

Duodecimal: 10418

Hexadecimal: 5354

Square: 455054224

Square Root: 146.05478424207814

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 1-separable partitions of n; see Comments. A239467

Numbers that are the sum of seven fourth powers in six or more ways. A345572

Numbers that are the sum of seven fourth powers in seven or more ways. A345573

Numbers that are the sum of seven fourth powers in eight or more ways. A345574

Numbers that are the sum of seven fourth powers in nine or more ways. A345575

Numbers that are the sum of seven fourth powers in exactly nine ways. A345831

Numbers k that divide ∑_j=1..k A051953(j) where A051953(j) = j - φ(j). Arithmetic mean of first k cototient values is an integer. A63986

a(n) is the nearest integer to sqrt(π(10ⁿ)) (see A006880). A221205

Numbers m such that σ(m) is a partition number. A252891

Consider the mapping f(a/b) = (a² + b)/(a² - b). Taking a =2, b = 1 to start with and carrying out this mapping repeatedly on each new (reduced) rational number gives the following sequence 2/1,5/3,14/11,207/185,... Sequence contains the denominators. A81484