1221103221101 has 16 divisors (see below), whose sum is σ = 1249140372480. Its totient is φ = 1193253135360.

The previous prime is 1221103221089. The next prime is 1221103221103. The reversal of 1221103221101 is 1011223011221.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221103221101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221103221101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221103221103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129363140 + ... + 129372578.

It is an arithmetic number, because the mean of its divisors is an integer number (78071273280).

Almost surely, 2^{1221103221101} is an apocalyptic number.

It is an amenable number.

1221103221101 is a deficient number, since it is larger than the sum of its proper divisors (28037151379).

1221103221101 is an equidigital number, since it uses as much as digits as its factorization.

1221103221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19036.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1221103221101 its reverse (1011223011221), we get a palindrome (2232326232322).

The spelling of 1221103221101 in words is "one trillion, two hundred twenty-one billion, one hundred three million, two hundred twenty-one thousand, one hundred one".