1221310303303 has 4 divisors (see below), whose sum is σ = 1221353954200. Its totient is φ = 1221266652408.

The previous prime is 1221310303219. The next prime is 1221310303313. The reversal of 1221310303303 is 3033030131221.

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 1221310303303 - 2²⁵ = 1221276748871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221310303313) 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 3 ways as a sum of consecutive naturals, for example, 21783453 + ... + 21839446.

It is an arithmetic number, because the mean of its divisors is an integer number (305338488550).

Almost surely, 2^{1221310303303} is an apocalyptic number.

1221310303303 is a deficient number, since it is larger than the sum of its proper divisors (43650897).

1221310303303 is an equidigital number, since it uses as much as digits as its factorization.

1221310303303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43650896.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 1221310303303 its reverse (3033030131221), we get a palindrome (4254340434524).

The spelling of 1221310303303 in words is "one trillion, two hundred twenty-one billion, three hundred ten million, three hundred three thousand, three hundred three".