1221131331322 has 96 divisors (see below), whose sum is σ = 2219716656000. Its totient is φ = 503506789632.

The previous prime is 1221131331319. The next prime is 1221131331323. The reversal of 1221131331322 is 2231331311221.

It is not an unprimeable number, because it can be changed into a prime (1221131331323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 84976554 + ... + 84990922.

It is an arithmetic number, because the mean of its divisors is an integer number (23122048500).

Almost surely, 2^{1221131331322} is an apocalyptic number.

1221131331322 is a deficient number, since it is larger than the sum of its proper divisors (998585324678).

1221131331322 is an equidigital number, since it uses as much as digits as its factorization.

1221131331322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14545 (or 14488 counting only the distinct ones).

The product of its digits is 1296, while the sum is 25.

Adding to 1221131331322 its reverse (2231331311221), we get a palindrome (3452462642543).

The spelling of 1221131331322 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-one million, three hundred thirty-one thousand, three hundred twenty-two".