1321103 has 4 divisors (see below), whose sum is σ = 1509840. Its totient is φ = 1132368.

The previous prime is 1321093. The next prime is 1321109. The reversal of 1321103 is 3011231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1321103 - 2¹⁶ = 1255567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321109) 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, 94358 + ... + 94371.

It is an arithmetic number, because the mean of its divisors is an integer number (377460).

2^1321103 is an apocalyptic number.

1321103 is a deficient number, since it is larger than the sum of its proper divisors (188737).

1321103 is an equidigital number, since it uses as much as digits as its factorization.

1321103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188736.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 1321103 is about 1149.3924482091. The cubic root of 1321103 is about 109.7266767928.

Adding to 1321103 its reverse (3011231), we get a palindrome (4332334).

The spelling of 1321103 in words is "one million, three hundred twenty-one thousand, one hundred three".