1321312003 has 8 divisors (see below), whose sum is σ = 1517296320. Its totient is φ = 1137971880.

The previous prime is 1321311991. The next prime is 1321312009. The reversal of 1321312003 is 3002131231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321312003 - 2²¹ = 1319214851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321312009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3160825 + ... + 3161242.

It is an arithmetic number, because the mean of its divisors is an integer number (189662040).

Almost surely, 2^1321312003 is an apocalyptic number.

1321312003 is a deficient number, since it is larger than the sum of its proper divisors (195984317).

1321312003 is a wasteful number, since it uses less digits than its factorization.

1321312003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6322097.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1321312003 is about 36349.8556118178. The cubic root of 1321312003 is about 1097.3246286585.

Adding to 1321312003 its reverse (3002131231), we get a palindrome (4323443234).

The spelling of 1321312003 in words is "one billion, three hundred twenty-one million, three hundred twelve thousand, three".