12121201121 has 4 divisors (see below), whose sum is σ = 12123620244. Its totient is φ = 12118782000.

The previous prime is 12121201109. The next prime is 12121201129. The reversal of 12121201121 is 12110212121.

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 5228880721 + 6892320400 = 72311^2 + 83020^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121201121 - 2¹⁰ = 12121200097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12121201096 and 12121201105.

It is not an unprimeable number, because it can be changed into a prime (12121201129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1202030 + ... + 1212071.

It is an arithmetic number, because the mean of its divisors is an integer number (3030905061).

Almost surely, 2^12121201121 is an apocalyptic number.

It is an amenable number.

12121201121 is a deficient number, since it is larger than the sum of its proper divisors (2419123).

12121201121 is an equidigital number, since it uses as much as digits as its factorization.

12121201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419122.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12121201121 its reverse (12110212121), we get a palindrome (24231413242).

The spelling of 12121201121 in words is "twelve billion, one hundred twenty-one million, two hundred one thousand, one hundred twenty-one".