3221

3221 is a prime number.

3221 has a representation as a sum of two squares: 3221 = 14² + 55².

3221 is the hypotenuse of a primitive Pythagorean triple: 3221² = 1540² + 2829².

3221 is a divisor of 11⁵ - 1.

3221 is the sum of four positive fifth powers (A003349): 3221 = 5⁵ + 2⁵ + 2⁵ + 2⁵.

3221 is a number n such that googol - n is prime (A108251).

Source: On-Line Encyclopedia of Integer Sequences