321103 has 6 divisors (see below), whose sum is σ = 336224. Its totient is φ = 306636.

The previous prime is 321091. The next prime is 321109. The reversal of 321103 is 301123.

It is not a de Polignac number, because 321103 - 2⁹ = 320591 is a prime.

It is a Duffinian number.

321103 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 321103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 226 + ... + 832.

2³²¹¹⁰³ is an apocalyptic number.

321103 is a deficient number, since it is larger than the sum of its proper divisors (15121).

321103 is an equidigital number, since it uses as much as digits as its factorization.

321103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 321103 is about 566.6595097587. The cubic root of 321103 is about 68.4775353902.

Adding to 321103 its reverse (301123), we get a palindrome (622226).

It can be divided in two parts, 321 and 103, that added together give a palindrome (424).

The spelling of 321103 in words is "three hundred twenty-one thousand, one hundred three", and thus it is an iban number.