11122221111 has 16 divisors (see below), whose sum is σ = 15024437760. Its totient is φ = 7317498240.

The previous prime is 11122221109. The next prime is 11122221133. The reversal of 11122221111 is 11112222111.

It is a happy number.

It is not a de Polignac number, because 11122221111 - 2¹ = 11122221109 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11122221181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552031 + ... + 571823.

It is an arithmetic number, because the mean of its divisors is an integer number (939027360).

Almost surely, 2^11122221111 is an apocalyptic number.

11122221111 is a deficient number, since it is larger than the sum of its proper divisors (3902216649).

11122221111 is a wasteful number, since it uses less digits than its factorization.

11122221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22246.

The product of its digits is 16, while the sum is 15.

Adding to 11122221111 its reverse (11112222111), we get a palindrome (22234443222).

The spelling of 11122221111 in words is "eleven billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred eleven".