Properties of the Number 21402

Twenty-One Thousand Four Hundred Two

Basics

Value: 21401 → 21402 → 21403

Parity: even

Prime: No

Previous Prime: 21401

Next Prime: 21407

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 29 × 41

Divisors: 1, 2, 3, 6, 9, 18, 29, 41, 58, 82

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001110011010

Octal: 51632

Duodecimal: 10476

Hexadecimal: 539a

Square: 458045604

Square Root: 146.2942240828393

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

a(0) = 0; for n>0, a(n) = maximal number of regions into which space can be divided by n spheres. A46127

Expansion of 1 / ((1-x)²*(1-x²)*(1-x³)*...*(1-x⁸)). A288343

a(n) = number of partitions p of n such that the least multiplicity of the parts of p is a part of p. A365614

Numbers n such that n·x/(x-1) produces a rotation of the digits in n for some value of x. A288669

a(n) = ∑_{i=1..floor((n+2)/4)} a(2i-1)*a(n-2i+1), with a(1)=3, a(2)=1, and a(3)=2. A24963

McKay-Thompson series of class 26A for Monster. A58596

Number of partitions p of n such that max(p) - (number of parts of p) is a part of p. A238544

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 78", based on the 5-celled von Neumann neighborhood. A270093

a(n) = (1/5ⁿ) * ∑_k=0..n² ( (binomial(n², k) * 2^n²-k * 3^k) (mod 5ⁿ) ). A376535

Decimal expansion of 1/398. A21402