11122121122111 has 4 divisors (see below), whose sum is σ = 11129937090592. Its totient is φ = 11114305153632.

The previous prime is 11122121122037. The next prime is 11122121122129. The reversal of 11122121122111 is 11122112122111.

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

It is a cyclic number.

It is not a de Polignac number, because 11122121122111 - 2⁹ = 11122121121599 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 (11122121122141) 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 3 ways as a sum of consecutive naturals, for example, 3907982106 + ... + 3907984951.

It is an arithmetic number, because the mean of its divisors is an integer number (2782484272648).

Almost surely, 2^{11122121122111} is an apocalyptic number.

11122121122111 is a deficient number, since it is larger than the sum of its proper divisors (7815968481).

11122121122111 is an equidigital number, since it uses as much as digits as its factorization.

11122121122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7815968480.

The product of its digits is 32, while the sum is 19.

Adding to 11122121122111 its reverse (11122112122111), we get a palindrome (22244233244222).

Subtracting from 11122121122111 its reverse (11122112122111), we obtain a square (9000000 = 3000²).

The spelling of 11122121122111 in words is "eleven trillion, one hundred twenty-two billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred eleven".