Properties of the Number 21830

Twenty-One Thousand Eight Hundred Thirty

Basics

Value: 21829 → 21830 → 21831

Parity: even

Prime: No

Previous Prime: 21821

Next Prime: 21839

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 × 5 × 37 × 59

Divisors: 1, 2, 5, 10, 37, 59, 74, 118, 185, 295

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010101000110

Octal: 52506

Duodecimal: 10772

Hexadecimal: 5546

Square: 476548900

Square Root: 147.74978849392645

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 having (sum of odd parts) >= (sum of even parts). A239263

Number of strict (distinct parts) plane partitions of n with relatively prime parts. A323587

a(n) = 16·n² - 2·n. A158058

Number of permutations of length n having exactly one descent such that the first element of the permutation is an odd number. A257198

Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero and first and second differences in -6..6. A208968

T(n,k) is the number of n-bead necklaces labeled with numbers -k..k allowing reversal, with sum zero and first and second differences in -k..k. A208970

Decimal expansion of 1/826. A21830