11123221021111 has 16 divisors (see below), whose sum is σ = 11213691049440. Its totient is φ = 11033137889280.

The previous prime is 11123221021109. The next prime is 11123221021127. The reversal of 11123221021111 is 11112012232111.

It is a cyclic number.

It is not a de Polignac number, because 11123221021111 - 2¹ = 11123221021109 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 (11123221061111) 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, 290609271 + ... + 290647543.

It is an arithmetic number, because the mean of its divisors is an integer number (700855690590).

Almost surely, 2^{11123221021111} is an apocalyptic number.

11123221021111 is a deficient number, since it is larger than the sum of its proper divisors (90470028329).

11123221021111 is a wasteful number, since it uses less digits than its factorization.

11123221021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43266.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 11123221021111 its reverse (11112012232111), we get a palindrome (22235233253222).

The spelling of 11123221021111 in words is "eleven trillion, one hundred twenty-three billion, two hundred twenty-one million, twenty-one thousand, one hundred eleven".