Properties of the Number 21875

Twenty-One Thousand Eight Hundred Seventy-Five

Basics

Value: 21874 → 21875 → 21876

Parity: odd

Prime: No

Previous Prime: 21871

Next Prime: 21881

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 5 ⁵ × 7

Divisors: 1, 5, 7, 25, 35, 125, 175, 625, 875, 3125

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010101110011

Octal: 52563

Duodecimal: 107AB

Hexadecimal: 5573

Square: 478515625

Square Root: 147.9019945774904

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 partitions of n for which the number of odd parts is equal to the positive alternating sum of the parts. A277103

Hypotenuses for which there exist exactly 5 distinct Pythagorean triangles. A84649

Triangle read by rows: coefficients T(n,k) of a binomial decomposition of 2ⁿ-1 as Sum(k=0..n)T(n,k)*binomial(n,k). A244124

Triangle read by rows: coefficients T(n,k) of a binomial decomposition of n*(-1)ⁿ as Sum(k=0..n)T(n,k)*binomial(n,k). A244140

Triangle read by rows: terms T(n,k) of a binomial decomposition of n*(-1)ⁿ as Sum(k=0..n)T(n,k). A244141

Numbers of the form 5ⁱ*7^j with i, j >= 0. A3595

Numbers whose prime factors are 5 and 7. A33851

a(n) = A064989(A324886(n)). A329044

5th binomial transform of (0,0,0,1,0,0,0,0,......). A81143

Triangle whose (i,j)-th entry is 5^i-j*binomial(i,j). A38243