12111022021121 has 4 divisors (see below), whose sum is σ = 12117930763332. Its totient is φ = 12104113278912.

The previous prime is 12111022021117. The next prime is 12111022021187. The reversal of 12111022021121 is 12112022011121.

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 3047430084721 + 9063591936400 = 1745689^2 + 3010580^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111022021121 - 2² = 12111022021117 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 12111022021121.

It is not an unprimeable number, because it can be changed into a prime (12111022021421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3454368476 + ... + 3454371981.

It is an arithmetic number, because the mean of its divisors is an integer number (3029482690833).

Almost surely, 2^{12111022021121} is an apocalyptic number.

It is an amenable number.

12111022021121 is a deficient number, since it is larger than the sum of its proper divisors (6908742211).

12111022021121 is an equidigital number, since it uses as much as digits as its factorization.

12111022021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6908742210.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12111022021121 its reverse (12112022011121), we get a palindrome (24223044032242).

The spelling of 12111022021121 in words is "twelve trillion, one hundred eleven billion, twenty-two million, twenty-one thousand, one hundred twenty-one".