Properties of the Number 21479

Twenty-One Thousand Four Hundred Seventy-Nine

Basics

Value: 21478 → 21479 → 21480

Parity: odd

Prime: No

Previous Prime: 21467

Next Prime: 21481

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 47 × 457

Divisors: 1, 47, 457, 21479

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001111100111

Octal: 51747

Duodecimal: 1051B

Hexadecimal: 53e7

Square: 461347441

Square Root: 146.55715608594485

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

Composite and every divisor (except 1) contains the digit 4. A62670

Integers n such that 10ⁿ+99 is prime. A110980

Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 606", based on the 5-celled von Neumann neighborhood. A289891

Numbers n such that the sum of the prime factors of n equals the product of the digits of n. A67173

Number of partitions p of 2n such that n - (number of parts of p) is a part of p. A238607

Numbers k such that the product of the digits of k is equal to the sum of the prime factors of k, counted with multiplicity. A65774

Odd numbers n for which 19 is the smallest i (>= 1) with Jacobi symbol J(i,n) getting either a value 0 or -1. A112078

Sum over all partitions λ of n into 4 distinct parts of ∏_i:λ prime(i). A258359

Numbers whose arithmetic derivative is equal to the product of their digits. A266816

Numbers k such that the product of distinct digits of k equals the sum of the prime divisors of k. A357262