12211001122121 has 4 divisors (see below), whose sum is σ = 12211264853700. Its totient is φ = 12210737390544.

The previous prime is 12211001122091. The next prime is 12211001122139. The reversal of 12211001122121 is 12122110011221.

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 6763146366025 + 5447854756096 = 2600605^2 + 2334064^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211001122121 - 2¹⁸ = 12211000859977 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 12211001122121.

It is not an unprimeable number, because it can be changed into a prime (12211001122171) 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, 131796326 + ... + 131888943.

It is an arithmetic number, because the mean of its divisors is an integer number (3052816213425).

Almost surely, 2^{12211001122121} is an apocalyptic number.

It is an amenable number.

12211001122121 is a deficient number, since it is larger than the sum of its proper divisors (263731579).

12211001122121 is an equidigital number, since it uses as much as digits as its factorization.

12211001122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263731578.

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

Adding to 12211001122121 its reverse (12122110011221), we get a palindrome (24333111133342).

The spelling of 12211001122121 in words is "twelve trillion, two hundred eleven billion, one million, one hundred twenty-two thousand, one hundred twenty-one".