2101

2101 = 11 x 191.

2101 is a hendecagonal (11-gonal) number.

2101 is a centered heptagonal number.

2101 is a centered 10-gonal number.

2101 is a number n such that n, n + 1, and n + 2 are each the product of two primes: 2101 = 11 x 191, 2102 = 2 x 1051, 2103 = 3 x 701.

2101 is a number that yields a prime whenever a 1 is inserted anywhere in them, including the beginning or the end: 12101, 21101, and 21011 are all primes.


2101 Adonis was one of the first near-Earth asteroids to be discovered.

Source: On-Line Encyclopedia of Integer Sequences