1100221011221 has 4 divisors (see below), whose sum is σ = 1164939894252. Its totient is φ = 1035502128192.

The previous prime is 1100221011217. The next prime is 1100221011257. The reversal of 1100221011221 is 1221101220011.

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

It can be written as a sum of positive squares in 2 ways, for example, as 770113308721 + 330107702500 = 877561^2 + 574550^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100221011221 - 2² = 1100221011217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1100221011196 and 1100221011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100221011271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32359441490 + ... + 32359441523.

It is an arithmetic number, because the mean of its divisors is an integer number (291234973563).

Almost surely, 2^{1100221011221} is an apocalyptic number.

It is an amenable number.

1100221011221 is a deficient number, since it is larger than the sum of its proper divisors (64718883031).

1100221011221 is an equidigital number, since it uses as much as digits as its factorization.

1100221011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64718883030.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1100221011221 its reverse (1221101220011), we get a palindrome (2321322231232).

The spelling of 1100221011221 in words is "one trillion, one hundred billion, two hundred twenty-one million, eleven thousand, two hundred twenty-one".