The Number
21391
Twenty-One Thousand Three Hundred and Ninety-One
In Base 7 Septenary Is
1162367
The numbers with a 7 subscript use Base 7 Septenary notation.
For more familiar numbers: See Twenty-One Thousand Three Hundred and Ninety-One 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.
2.1391e4
Reciprocal
A number multiplied with its reciprocal is one.
0.0000053333221515334242137
The reciprocal of 21391 in Base 7 Septenary.
Palindrome?
A numerical palindrome has the same value when all of its digits are reversed.
The number 1162367 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 three hundred and ninety-one is the 2401st prime number. See primes in Base 7 Septenary
Not A Composite
Composites have more than just these two factors.
Twenty-One Thousand Three Hundred and Ninety-One is not a composite number because it has exactly two factors: One and Twenty-One Thousand Three Hundred and Ninety-One
Prime Factors
The number twenty-one thousand three hundred and ninety-one 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
11623671
= 1162367
Base Conversions
The number twenty-one thousand three hundred and ninety-one in 35 different bases