1320403121 has 2 divisors, whose sum is σ = 1320403122. Its totient is φ = 1320403120.

The previous prime is 1320403111. The next prime is 1320403129. The reversal of 1320403121 is 1213040231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 934830625 + 385572496 = 30575^2 + 19636^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320403121 - 2³⁰ = 246661297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1320403121.

It is not a weakly prime, because it can be changed into another prime (1320403129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660201560 + 660201561.

It is an arithmetic number, because the mean of its divisors is an integer number (660201561).

Almost surely, 2^1320403121 is an apocalyptic number.

It is an amenable number.

1320403121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320403121 is an equidigital number, since it uses as much as digits as its factorization.

1320403121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1320403121 is about 36337.3515958442. The cubic root of 1320403121 is about 1097.0729678431.

Adding to 1320403121 its reverse (1213040231), we get a palindrome (2533443352).

The spelling of 1320403121 in words is "one billion, three hundred twenty million, four hundred three thousand, one hundred twenty-one".