1321103345 has 16 divisors (see below), whose sum is σ = 1670808000. Its totient is φ = 1000029888.

The previous prime is 1321103341. The next prime is 1321103359. The reversal of 1321103345 is 5433011231.

It is not a de Polignac number, because 1321103345 - 2² = 1321103341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321103345.

It is not an unprimeable number, because it can be changed into a prime (1321103341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73511 + ... + 89699.

It is an arithmetic number, because the mean of its divisors is an integer number (104425500).

Almost surely, 2^1321103345 is an apocalyptic number.

It is an amenable number.

1321103345 is a deficient number, since it is larger than the sum of its proper divisors (349704655).

1321103345 is a wasteful number, since it uses less digits than its factorization.

1321103345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17072.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1321103345 is about 36346.9853633008. The cubic root of 1321103345 is about 1097.2668634434.

Adding to 1321103345 its reverse (5433011231), we get a palindrome (6754114576).

The spelling of 1321103345 in words is "one billion, three hundred twenty-one million, one hundred three thousand, three hundred forty-five".