1321330403 has 4 divisors (see below), whose sum is σ = 1325116800. Its totient is φ = 1317544008.

The previous prime is 1321330337. The next prime is 1321330447. The reversal of 1321330403 is 3040331231.

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 1321330403 - 2²² = 1317136099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321330463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1892675 + ... + 1893372.

It is an arithmetic number, because the mean of its divisors is an integer number (331279200).

Almost surely, 2^1321330403 is an apocalyptic number.

1321330403 is a deficient number, since it is larger than the sum of its proper divisors (3786397).

1321330403 is an equidigital number, since it uses as much as digits as its factorization.

1321330403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3786396.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 1321330403 is about 36350.1087068526. The cubic root of 1321330403 is about 1097.3297222522.

Adding to 1321330403 its reverse (3040331231), we get a palindrome (4361661634).

The spelling of 1321330403 in words is "one billion, three hundred twenty-one million, three hundred thirty thousand, four hundred three".