1221021112113 has 12 divisors (see below), whose sum is σ = 1924033267728. Its totient is φ = 740012795160.

The previous prime is 1221021112081. The next prime is 1221021112147. The reversal of 1221021112113 is 3112111201221.

It is a happy number.

It is not a de Polignac number, because 1221021112113 - 2⁵ = 1221021112081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221021112183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6166773195 + ... + 6166773392.

It is an arithmetic number, because the mean of its divisors is an integer number (160336105644).

Almost surely, 2^{1221021112113} is an apocalyptic number.

It is an amenable number.

1221021112113 is a deficient number, since it is larger than the sum of its proper divisors (703012155615).

1221021112113 is a wasteful number, since it uses less digits than its factorization.

1221021112113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12333546604 (or 12333546601 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1221021112113 its reverse (3112111201221), we get a palindrome (4333132313334).

The spelling of 1221021112113 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred twelve thousand, one hundred thirteen".