Number Gossip
(Enter a number and I'll tell you everything you wanted to know about it but were afraid to ask.)
Unique Properties of 1021
- 1021 is the smallest four-digit prime whose sum of digits is equal to its length
- 1021 is the smallest four-digit prime which yield a prime after removing two outermost digits
- 1021 is the smallest prime number in which the sum of the external digits equals the sum of the internal digits