12021112221121 has 4 divisors (see below), whose sum is σ = 12218179634644. Its totient is φ = 11824044807600.

The previous prime is 12021112221113. The next prime is 12021112221161. The reversal of 12021112221121 is 12112221112021.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 175393440000 + 11845718781121 = 418800^2 + 3441761^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021112221121 - 2³ = 12021112221113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021112221161) 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, 98533706670 + ... + 98533706791.

It is an arithmetic number, because the mean of its divisors is an integer number (3054544908661).

Almost surely, 2^{12021112221121} is an apocalyptic number.

It is an amenable number.

12021112221121 is a deficient number, since it is larger than the sum of its proper divisors (197067413523).

12021112221121 is an equidigital number, since it uses as much as digits as its factorization.

12021112221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197067413522.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12021112221121 its reverse (12112221112021), we get a palindrome (24133333333142).

The spelling of 12021112221121 in words is "twelve trillion, twenty-one billion, one hundred twelve million, two hundred twenty-one thousand, one hundred twenty-one".