1221333220323 has 6 divisors (see below), whose sum is σ = 1764147984924. Its totient is φ = 814222146876.

The previous prime is 1221333220313. The next prime is 1221333220339. The reversal of 1221333220323 is 3230223331221.

1221333220323 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 3 + 332 + 2 + 0 + 323 = 666.

It is not a de Polignac number, because 1221333220323 - 2⁵ = 1221333220291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221333220313) 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 in 5 ways as a sum of consecutive naturals, for example, 67851845565 + ... + 67851845582.

It is an arithmetic number, because the mean of its divisors is an integer number (294024664154).

Almost surely, 2^{1221333220323} is an apocalyptic number.

1221333220323 is a deficient number, since it is larger than the sum of its proper divisors (542814764601).

1221333220323 is a wasteful number, since it uses less digits than its factorization.

1221333220323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135703691153 (or 135703691150 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 27.

Adding to 1221333220323 its reverse (3230223331221), we get a palindrome (4451556551544).

The spelling of 1221333220323 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-three million, two hundred twenty thousand, three hundred twenty-three".