1×1021

1×1021 is the product of 1 and 1021, which equals 1021. In mathematics, 1 is the multiplicative identity, so multiplying any integer by 1 yields the same value. The expression serves as an example of the identity property in arithmetic.

1021 is a prime number. Its only positive divisors are 1 and 1021, and it is odd. As a four-digit decimal number, it appears in standard base-10 notation as 1021.

In other representations, 1021 can be written in binary as 1111111101. In Roman numerals, it is written as MXXI (M = 1000, XX = 20, I = 1), which sums to 1021.

The number 1021 also appears in historical and calendrical contexts as a year (AD 1021) and can arise in various mathematical scenarios, such as examples or primes lists, due to its prime status and distinct digit structure.