11091111021 has 6 divisors (see below), whose sum is σ = 16020493710. Its totient is φ = 7394074008.

The previous prime is 11091111019. The next prime is 11091111029. The reversal of 11091111021 is 12011119011.

11091111021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9392517225 + 1698593796 = 96915^2 + 41214^2 .

It is not a de Polignac number, because 11091111021 - 2¹ = 11091111019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11091110985 and 11091111003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11091111029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 616172826 + ... + 616172843.

It is an arithmetic number, because the mean of its divisors is an integer number (2670082285).

Almost surely, 2^11091111021 is an apocalyptic number.

It is an amenable number.

11091111021 is a deficient number, since it is larger than the sum of its proper divisors (4929382689).

11091111021 is a wasteful number, since it uses less digits than its factorization.

11091111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232345675 (or 1232345672 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 18.

The spelling of 11091111021 in words is "eleven billion, ninety-one million, one hundred eleven thousand, twenty-one".