The Number
7
Seven
In Base 21 Unovigesimal Is
721
The numbers with a 21 subscript use Base 21 Unovigesimal notation.
For more familiar numbers: See 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.
7e0
Reciprocal
A number multiplied with its reciprocal is one.
0.321
The reciprocal of 7 in Base 21 Unovigesimal.
Palindrome?
A numerical palindrome has the same value when all of its digits are reversed.
The number 721 is a palindrome.
A Prime Number
A prime number is a positive integer that is divisible only by itself and one.
Seven is the 4th prime number. See primes in Base 21 Unovigesimal
Not A Composite
Composites have more than just these two factors.
Seven is not a composite number because it has exactly two factors: One and Seven
Prime Factors
The number 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
7211
= 721
Base Conversions
The number seven in 35 different bases