11011212121121 has 16 divisors (see below), whose sum is σ = 11602045887360. Its totient is φ = 10421512928640.

The previous prime is 11011212121079. The next prime is 11011212121171. The reversal of 11011212121121 is 12112121211011.

It is a cyclic number.

It is not a de Polignac number, because 11011212121121 - 2⁶ = 11011212121057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11011212121121.

It is not an unprimeable number, because it can be changed into a prime (11011212121171) 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 15 ways as a sum of consecutive naturals, for example, 82626875 + ... + 82760031.

It is an arithmetic number, because the mean of its divisors is an integer number (725127867960).

Almost surely, 2^{11011212121121} is an apocalyptic number.

It is an amenable number.

11011212121121 is a deficient number, since it is larger than the sum of its proper divisors (590833766239).

11011212121121 is a wasteful number, since it uses less digits than its factorization.

11011212121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137384.

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

Adding to 11011212121121 its reverse (12112121211011), we get a palindrome (23123333332132).

The spelling of 11011212121121 in words is "eleven trillion, eleven billion, two hundred twelve million, one hundred twenty-one thousand, one hundred twenty-one".