321220103 has 2 divisors, whose sum is σ = 321220104. Its totient is φ = 321220102.

The previous prime is 321220087. The next prime is 321220147. The reversal of 321220103 is 301022123.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321220103 - 2⁴ = 321220087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321220183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160610051 + 160610052.

It is an arithmetic number, because the mean of its divisors is an integer number (160610052).

Almost surely, 2^321220103 is an apocalyptic number.

321220103 is a deficient number, since it is larger than the sum of its proper divisors (1).

321220103 is an equidigital number, since it uses as much as digits as its factorization.

321220103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 321220103 is about 17922.6142903316. The cubic root of 321220103 is about 684.8585873216.

Adding to 321220103 its reverse (301022123), we get a palindrome (622242226).

The spelling of 321220103 in words is "three hundred twenty-one million, two hundred twenty thousand, one hundred three".