1321103305 has 16 divisors (see below), whose sum is σ = 1594966464. Its totient is φ = 1050475840.

The previous prime is 1321103297. The next prime is 1321103309. The reversal of 1321103305 is 5033011231.

It is not a de Polignac number, because 1321103305 - 2³ = 1321103297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321103309) 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, 683190 + ... + 685120.

It is an arithmetic number, because the mean of its divisors is an integer number (99685404).

Almost surely, 2^1321103305 is an apocalyptic number.

It is an amenable number.

1321103305 is a deficient number, since it is larger than the sum of its proper divisors (273863159).

1321103305 is a wasteful number, since it uses less digits than its factorization.

1321103305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2696.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 1321103305 is about 36346.9848130488. The cubic root of 1321103305 is about 1097.2668523692.

Adding to 1321103305 its reverse (5033011231), we get a palindrome (6354114536).

The spelling of 1321103305 in words is "one billion, three hundred twenty-one million, one hundred three thousand, three hundred five".