Properties of the Number 21415

Twenty-One Thousand Four Hundred Fifteen

Basics

Value: 21414 → 21415 → 21416

Parity: odd

Prime: No

Previous Prime: 21407

Next Prime: 21419

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 × 4283

Divisors: 1, 5, 4283, 21415

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001110100111

Octal: 51647

Duodecimal: 10487

Hexadecimal: 53a7

Square: 458602225

Square Root: 146.338648346908

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 subsets of {1..n} such that it is possible to choose a different binary index of each element. A370636

Number of pairwise coprime compositions of n, where a singleton is not considered coprime unless it is (1). A337462

Numbers n such that φ(reverse(n)) = σ(n). A70835

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

Number of partitions of n into numbers having in binary representation at most trailing zeros. A87750

Decimal expansion of 1/411. A21415