1221311303323 has 2 divisors, whose sum is σ = 1221311303324. Its totient is φ = 1221311303322.

The previous prime is 1221311303309. The next prime is 1221311303357. The reversal of 1221311303323 is 3233031131221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221311303323 - 2²¹ = 1221309206171 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221311303383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610655651661 + 610655651662.

It is an arithmetic number, because the mean of its divisors is an integer number (610655651662).

Almost surely, 2^{1221311303323} is an apocalyptic number.

1221311303323 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221311303323 is an equidigital number, since it uses as much as digits as its factorization.

1221311303323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 1221311303323 its reverse (3233031131221), we get a palindrome (4454342434544).

The spelling of 1221311303323 in words is "one trillion, two hundred twenty-one billion, three hundred eleven million, three hundred three thousand, three hundred twenty-three".