11121221101111 has 18 divisors (see below), whose sum is σ = 12346383027608. Its totient is φ = 10010098890000.

The previous prime is 11121221101099. The next prime is 11121221101117. The reversal of 11121221101111 is 11110112212111.

It is not a de Polignac number, because 11121221101111 - 2⁵ = 11121221101079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121221101117) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3270675 + ... + 5739316.

Almost surely, 2^{11121221101111} is an apocalyptic number.

11121221101111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11121221101111 is a deficient number, since it is larger than the sum of its proper divisors (1225161926497).

11121221101111 is an equidigital number, since it uses as much as digits as its factorization.

11121221101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9010215 (or 9010103 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 11121221101111 its reverse (11110112212111), we get a palindrome (22231333313222).

The spelling of 11121221101111 in words is "eleven trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, one hundred eleven".