The Number
21997
Twenty-One Thousand Nine Hundred and Ninety-Seven
In Base 18 Octodecimal Is
3dg118
The numbers with a 18 subscript use Base 18 Octodecimal notation.
For more familiar numbers: See Twenty-One Thousand Nine Hundred and Ninety-Seven in Base 10 Decimal
Nearby Numbers
Positive, nonzero integers within three units
Scientific Notation
Scientific notation expresses a quantity as the product of its significand with 10 raised to an integer exponent.
2.1997e4
Reciprocal
A number multiplied with its reciprocal is one.
0.0004dg3hb0f8bc2618
The reciprocal of 21997 in Base 18 Octodecimal.
Palindrome?
A numerical palindrome has the same value when all of its digits are reversed.
The number 3dg118 is not a palindrome.
A Prime Number
A prime number is a positive integer that is divisible only by itself and one.
Twenty-one thousand nine hundred and ninety-seven is the 2464th prime number. See primes in Base 18 Octodecimal
Not A Composite
Composites have more than just these two factors.
Twenty-One Thousand Nine Hundred and Ninety-Seven is not a composite number because it has exactly two factors: One and Twenty-One Thousand Nine Hundred and Ninety-Seven
Prime Factors
The number twenty-one thousand nine hundred and ninety-seven has the following 1 prime factor:
Prime Factorization
The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities
3dg1181
= 3dg118
Base Conversions
The number twenty-one thousand nine hundred and ninety-seven in 35 different bases