1221323322112 has 72 divisors (see below), whose sum is σ = 2566655910000. Its totient is φ = 578415439872.

The previous prime is 1221323322061. The next prime is 1221323322133. The reversal of 1221323322112 is 2112233231221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30706014 + ... + 30745762.

It is an arithmetic number, because the mean of its divisors is an integer number (35647998750).

Almost surely, 2^{1221323322112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221323322112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1283327955000).

1221323322112 is an abundant number, since it is smaller than the sum of its proper divisors (1345332587888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221323322112 is an equidigital number, since it uses as much as digits as its factorization.

1221323322112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46101 (or 46087 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

Adding to 1221323322112 its reverse (2112233231221), we get a palindrome (3333556553333).

The spelling of 1221323322112 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-three million, three hundred twenty-two thousand, one hundred twelve".