1221331221113 has 4 divisors (see below), whose sum is σ = 1233188805888. Its totient is φ = 1209473636340.

The previous prime is 1221331221091. The next prime is 1221331221127. The reversal of 1221331221113 is 3111221331221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221331221113 - 2⁶ = 1221331221049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221331221133) 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, 5928792233 + ... + 5928792438.

It is an arithmetic number, because the mean of its divisors is an integer number (308297201472).

Almost surely, 2^{1221331221113} is an apocalyptic number.

It is an amenable number.

1221331221113 is a deficient number, since it is larger than the sum of its proper divisors (11857584775).

1221331221113 is a wasteful number, since it uses less digits than its factorization.

1221331221113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11857584774.

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

Adding to 1221331221113 its reverse (3111221331221), we get a palindrome (4332552552334).

The spelling of 1221331221113 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one million, two hundred twenty-one thousand, one hundred thirteen".