1221222233321 has 12 divisors (see below), whose sum is σ = 1261965540996. Its totient is φ = 1181754675360.

The previous prime is 1221222233299. The next prime is 1221222233333. The reversal of 1221222233321 is 1233322221221.

It can be written as a sum of positive squares in 2 ways, for example, as 184501175296 + 1036721058025 = 429536^2 + 1018195^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1221222233321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221222233381) 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 11 ways as a sum of consecutive naturals, for example, 21702995 + ... + 21759191.

It is an arithmetic number, because the mean of its divisors is an integer number (105163795083).

Almost surely, 2^{1221222233321} is an apocalyptic number.

It is an amenable number.

1221222233321 is a deficient number, since it is larger than the sum of its proper divisors (40743307675).

1221222233321 is an equidigital number, since it uses as much as digits as its factorization.

1221222233321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78872 (or 78841 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

Adding to 1221222233321 its reverse (1233322221221), we get a palindrome (2454544454542).

The spelling of 1221222233321 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred thirty-three thousand, three hundred twenty-one".