1321116503 has 8 divisors (see below), whose sum is σ = 1513290240. Its totient is φ = 1129803480.

The previous prime is 1321116479. The next prime is 1321116509. The reversal of 1321116503 is 3056111231.

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 1321116503 - 2⁶ = 1321116439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321116509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211883 + ... + 218028.

It is an arithmetic number, because the mean of its divisors is an integer number (189161280).

Almost surely, 2^1321116503 is an apocalyptic number.

1321116503 is a deficient number, since it is larger than the sum of its proper divisors (192173737).

1321116503 is an equidigital number, since it uses as much as digits as its factorization.

1321116503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430357.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1321116503 is about 36347.1663682329. The cubic root of 1321116503 is about 1097.2705063049.

Adding to 1321116503 its reverse (3056111231), we get a palindrome (4377227734).

The spelling of 1321116503 in words is "one billion, three hundred twenty-one million, one hundred sixteen thousand, five hundred three".