11001121111 has 4 divisors (see below), whose sum is σ = 11001344224. Its totient is φ = 11000898000.

The previous prime is 11001121069. The next prime is 11001121123. The reversal of 11001121111 is 11112110011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11001121111 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 (11001121151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1215 + ... + 148336.

It is an arithmetic number, because the mean of its divisors is an integer number (2750336056).

Almost surely, 2^11001121111 is an apocalyptic number.

11001121111 is a deficient number, since it is larger than the sum of its proper divisors (223113).

11001121111 is an equidigital number, since it uses as much as digits as its factorization.

11001121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223112.

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

Adding to 11001121111 its reverse (11112110011), we get a palindrome (22113231122).

It can be divided in two parts, 1100 and 1121111, that added together give a palindrome (1122211).

The spelling of 11001121111 in words is "eleven billion, one million, one hundred twenty-one thousand, one hundred eleven".