1221313322111 has 4 divisors (see below), whose sum is σ = 1244356969752. Its totient is φ = 1198269674472.

The previous prime is 1221313322107. The next prime is 1221313322143. The reversal of 1221313322111 is 1112233131221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221313322111 - 2² = 1221313322107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221313522111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11521823741 + ... + 11521823846.

It is an arithmetic number, because the mean of its divisors is an integer number (311089242438).

Almost surely, 2^{1221313322111} is an apocalyptic number.

1221313322111 is a deficient number, since it is larger than the sum of its proper divisors (23043647641).

1221313322111 is an equidigital number, since it uses as much as digits as its factorization.

1221313322111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23043647640.

The product of its digits is 432, while the sum is 23.

Adding to 1221313322111 its reverse (1112233131221), we get a palindrome (2333546453332).

The spelling of 1221313322111 in words is "one trillion, two hundred twenty-one billion, three hundred thirteen million, three hundred twenty-two thousand, one hundred eleven".