11121021111 has 32 divisors (see below), whose sum is σ = 15786150912. Its totient is φ = 6948381440.

The previous prime is 11121021089. The next prime is 11121021151. The reversal of 11121021111 is 11112012111.

It is a cyclic number.

It is not a de Polignac number, because 11121021111 - 2⁷ = 11121020983 is a prime.

It is a super-2 number, since 2×11121021111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121021151) 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 31 ways as a sum of consecutive naturals, for example, 3483526 + ... + 3486716.

It is an arithmetic number, because the mean of its divisors is an integer number (493317216).

Almost surely, 2^11121021111 is an apocalyptic number.

11121021111 is a deficient number, since it is larger than the sum of its proper divisors (4665129801).

11121021111 is a wasteful number, since it uses less digits than its factorization.

11121021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4223.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 11121021111 its reverse (11112012111), we get a palindrome (22233033222).

The spelling of 11121021111 in words is "eleven billion, one hundred twenty-one million, twenty-one thousand, one hundred eleven".