11121110212121 has 16 divisors (see below), whose sum is σ = 13820408818944. Its totient is φ = 8713691809344.

The previous prime is 11121110212111. The next prime is 11121110212139. The reversal of 11121110212121 is 12121201112111.

It is a cyclic number.

It is not a de Polignac number, because 11121110212121 - 2²² = 11121106017817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11121110212121.

It is not an unprimeable number, because it can be changed into a prime (11121110212111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 593243066 + ... + 593261811.

It is an arithmetic number, because the mean of its divisors is an integer number (863775551184).

Almost surely, 2^{11121110212121} is an apocalyptic number.

It is an amenable number.

11121110212121 is a deficient number, since it is larger than the sum of its proper divisors (2699298606823).

11121110212121 is a wasteful number, since it uses less digits than its factorization.

11121110212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186505000.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11121110212121 its reverse (12121201112111), we get a palindrome (23242311324232).

The spelling of 11121110212121 in words is "eleven trillion, one hundred twenty-one billion, one hundred ten million, two hundred twelve thousand, one hundred twenty-one".