321312103 has 4 divisors (see below), whose sum is σ = 367213840. Its totient is φ = 275410368.

The previous prime is 321312091. The next prime is 321312113. The reversal of 321312103 is 301213123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 301213123 = 17 ⋅17718419.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321312103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321312113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22950858 + ... + 22950871.

It is an arithmetic number, because the mean of its divisors is an integer number (91803460).

Almost surely, 2^321312103 is an apocalyptic number.

321312103 is a deficient number, since it is larger than the sum of its proper divisors (45901737).

321312103 is an equidigital number, since it uses as much as digits as its factorization.

321312103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45901736.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 321312103 is about 17925.1806964393. The cubic root of 321312103 is about 684.9239640681.

Adding to 321312103 its reverse (301213123), we get a palindrome (622525226).

The spelling of 321312103 in words is "three hundred twenty-one million, three hundred twelve thousand, one hundred three".