12011211022121 has 4 divisors (see below), whose sum is σ = 12013504556292. Its totient is φ = 12008917487952.

The previous prime is 12011211022067. The next prime is 12011211022123. The reversal of 12011211022121 is 12122011211021.

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 4893227140096 + 7117983882025 = 2212064^2 + 2667955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12011211022121 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 12011211022121.

It is not an unprimeable number, because it can be changed into a prime (12011211022123) 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, 1146759230 + ... + 1146769703.

It is an arithmetic number, because the mean of its divisors is an integer number (3003376139073).

Almost surely, 2^{12011211022121} is an apocalyptic number.

It is an amenable number.

12011211022121 is a deficient number, since it is larger than the sum of its proper divisors (2293534171).

12011211022121 is an equidigital number, since it uses as much as digits as its factorization.

12011211022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293534170.

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

Adding to 12011211022121 its reverse (12122011211021), we get a palindrome (24133222233142).

The spelling of 12011211022121 in words is "twelve trillion, eleven billion, two hundred eleven million, twenty-two thousand, one hundred twenty-one".