11011220121121 has 4 divisors (see below), whose sum is σ = 12012240132144. Its totient is φ = 10010200110100.

The previous prime is 11011220121073. The next prime is 11011220121173. The reversal of 11011220121121 is 12112102211011.

11011220121121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11011220121121 - 2⁹ = 11011220120609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11011220121095 and 11011220121104.

It is not an unprimeable number, because it can be changed into a prime (11011220221121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500510005495 + ... + 500510005516.

It is an arithmetic number, because the mean of its divisors is an integer number (3003060033036).

Almost surely, 2^{11011220121121} is an apocalyptic number.

11011220121121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11011220121121 is a deficient number, since it is larger than the sum of its proper divisors (1001020011023).

11011220121121 is a wasteful number, since it uses less digits than its factorization.

11011220121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001020011022.

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

Adding to 11011220121121 its reverse (12112102211011), we get a palindrome (23123322332132).

The spelling of 11011220121121 in words is "eleven trillion, eleven billion, two hundred twenty million, one hundred twenty-one thousand, one hundred twenty-one".