11011221221121 has 12 divisors (see below), whose sum is σ = 17351015257680. Its totient is φ = 6673467406680.

The previous prime is 11011221221083. The next prime is 11011221221131. The reversal of 11011221221121 is 12112212211011.

It is a happy number.

11011221221121 is a `hidden beast` number, since 1 + 101 + 1 + 221 + 221 + 121 = 666.

It is not a de Polignac number, because 11011221221121 - 2⁹ = 11011221220609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11011221221094 and 11011221221103.

It is not an unprimeable number, because it can be changed into a prime (11011221221131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55612228291 + ... + 55612228488.

It is an arithmetic number, because the mean of its divisors is an integer number (1445917938140).

Almost surely, 2^{11011221221121} is an apocalyptic number.

11011221221121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11011221221121 is a deficient number, since it is larger than the sum of its proper divisors (6339794036559).

11011221221121 is a wasteful number, since it uses less digits than its factorization.

11011221221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111224456796 (or 111224456793 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11011221221121 its reverse (12112212211011), we get a palindrome (23123433432132).

The spelling of 11011221221121 in words is "eleven trillion, eleven billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".