1103312321 has 4 divisors (see below), whose sum is σ = 1105803312. Its totient is φ = 1100821332.

The previous prime is 1103312297. The next prime is 1103312363. The reversal of 1103312321 is 1232133011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1232133011 = 17117 ⋅71983.

It is a de Polignac number, because none of the positive numbers 2^k-1103312321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1103312321.

It is not an unprimeable number, because it can be changed into a prime (1103312621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1244831 + ... + 1245716.

It is an arithmetic number, because the mean of its divisors is an integer number (276450828).

Almost surely, 2^1103312321 is an apocalyptic number.

It is an amenable number.

1103312321 is a deficient number, since it is larger than the sum of its proper divisors (2490991).

1103312321 is an equidigital number, since it uses as much as digits as its factorization.

1103312321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490990.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1103312321 is about 33216.1454867960. The cubic root of 1103312321 is about 1033.3152114639.

Adding to 1103312321 its reverse (1232133011), we get a palindrome (2335445332).

The spelling of 1103312321 in words is "one billion, one hundred three million, three hundred twelve thousand, three hundred twenty-one".