11001111121 has 16 divisors (see below), whose sum is σ = 14770723968. Its totient is φ = 7912886400.

The previous prime is 11001111119. The next prime is 11001111127. The reversal of 11001111121 is 12111110011.

It is a cyclic number.

It is not a de Polignac number, because 11001111121 - 2¹ = 11001111119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11001111098 and 11001111107.

It is not an unprimeable number, because it can be changed into a prime (11001111127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5494060 + ... + 5496061.

It is an arithmetic number, because the mean of its divisors is an integer number (923170248).

Almost surely, 2^11001111121 is an apocalyptic number.

11001111121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11001111121 is a deficient number, since it is larger than the sum of its proper divisors (3769612847).

11001111121 is a wasteful number, since it uses less digits than its factorization.

11001111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10990152.

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 11001111121 its reverse (12111110011), we get a palindrome (23112221132).

The spelling of 11001111121 in words is "eleven billion, one million, one hundred eleven thousand, one hundred twenty-one".