1221312303303 has 4 divisors (see below), whose sum is σ = 1628416404408. Its totient is φ = 814208202200.

The previous prime is 1221312303287. The next prime is 1221312303331. The reversal of 1221312303303 is 3033032131221.

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 1221312303303 - 2⁴ = 1221312303287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221312303503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203552050548 + ... + 203552050553.

It is an arithmetic number, because the mean of its divisors is an integer number (407104101102).

Almost surely, 2^{1221312303303} is an apocalyptic number.

1221312303303 is a deficient number, since it is larger than the sum of its proper divisors (407104101105).

1221312303303 is an equidigital number, since it uses as much as digits as its factorization.

1221312303303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407104101104.

The product of its (nonzero) digits is 1944, while the sum is 24.

Adding to 1221312303303 its reverse (3033032131221), we get a palindrome (4254344434524).

The spelling of 1221312303303 in words is "one trillion, two hundred twenty-one billion, three hundred twelve million, three hundred three thousand, three hundred three".