11000021121 has 24 divisors (see below), whose sum is σ = 16407346176. Its totient is φ = 7094243520.

The previous prime is 11000021111. The next prime is 11000021167. The reversal of 11000021121 is 12112000011.

It is a happy number.

It is not a de Polignac number, because 11000021121 - 2⁵ = 11000021089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11000021111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1061461 + ... + 1071773.

It is an arithmetic number, because the mean of its divisors is an integer number (683639424).

Almost surely, 2^11000021121 is an apocalyptic number.

It is an amenable number.

11000021121 is a deficient number, since it is larger than the sum of its proper divisors (5407325055).

11000021121 is a wasteful number, since it uses less digits than its factorization.

11000021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14173 (or 14170 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 11000021121 its reverse (12112000011), we get a palindrome (23112021132).

The spelling of 11000021121 in words is "eleven billion, twenty-one thousand, one hundred twenty-one".