1321310305 has 32 divisors (see below), whose sum is σ = 1831403520. Its totient is φ = 896441280.

The previous prime is 1321310297. The next prime is 1321310311. The reversal of 1321310305 is 5030131231.

It is not a de Polignac number, because 1321310305 - 2³ = 1321310297 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1597302 + ... + 1598128.

It is an arithmetic number, because the mean of its divisors is an integer number (57231360).

Almost surely, 2^1321310305 is an apocalyptic number.

It is an amenable number.

1321310305 is a deficient number, since it is larger than the sum of its proper divisors (510093215).

1321310305 is a wasteful number, since it uses less digits than its factorization.

1321310305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1269.

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

The square root of 1321310305 is about 36349.8322554589. The cubic root of 1321310305 is about 1097.3241586060.

Adding to 1321310305 its reverse (5030131231), we get a palindrome (6351441536).

The spelling of 1321310305 in words is "one billion, three hundred twenty-one million, three hundred ten thousand, three hundred five".