1221203321322 has 16 divisors (see below), whose sum is σ = 2445766220352. Its totient is φ = 406507844160.

The previous prime is 1221203321311. The next prime is 1221203321329. The reversal of 1221203321322 is 2231233021221.

It is a junction number, because it is equal to n+sod(n) for n = 1221203321292 and 1221203321301.

It is not an unprimeable number, because it can be changed into a prime (1221203321329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139977679 + ... + 139986402.

It is an arithmetic number, because the mean of its divisors is an integer number (152860388772).

Almost surely, 2^{1221203321322} is an apocalyptic number.

1221203321322 is an abundant number, since it is smaller than the sum of its proper divisors (1224562899030).

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

1221203321322 is a wasteful number, since it uses less digits than its factorization.

1221203321322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279964813.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 1221203321322 its reverse (2231233021221), we get a palindrome (3452436342543).

The spelling of 1221203321322 in words is "one trillion, two hundred twenty-one billion, two hundred three million, three hundred twenty-one thousand, three hundred twenty-two".