11100111222221 has 16 divisors (see below), whose sum is σ = 12981105037824. Its totient is φ = 9292941638064.

The previous prime is 11100111222217. The next prime is 11100111222229. The reversal of 11100111222221 is 12222211100111.

It is not a de Polignac number, because 11100111222221 - 2² = 11100111222217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11100111222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100111222229) 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, 17153270 + ... + 17788616.

It is an arithmetic number, because the mean of its divisors is an integer number (811319064864).

Almost surely, 2^{11100111222221} is an apocalyptic number.

It is an amenable number.

11100111222221 is a deficient number, since it is larger than the sum of its proper divisors (1880993815603).

11100111222221 is an equidigital number, since it uses as much as digits as its factorization.

11100111222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693440.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11100111222221 its reverse (12222211100111), we get a palindrome (23322322322332).

The spelling of 11100111222221 in words is "eleven trillion, one hundred billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty-one".