12121110212121 has 12 divisors (see below), whose sum is σ = 18429758217520. Its totient is φ = 7655438028600.

The previous prime is 12121110212119. The next prime is 12121110212177. The reversal of 12121110212121 is 12121201112121.

It is a happy number.

12121110212121 is a `hidden beast` number, since 121 + 211 + 1 + 0 + 212 + 121 = 666.

It is not a de Polignac number, because 12121110212121 - 2¹ = 12121110212119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121110212094 and 12121110212103.

It is not an unprimeable number, because it can be changed into a prime (12121110212191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35441842555 + ... + 35441842896.

Almost surely, 2^{12121110212121} is an apocalyptic number.

It is an amenable number.

12121110212121 is a deficient number, since it is larger than the sum of its proper divisors (6308648005399).

12121110212121 is a wasteful number, since it uses less digits than its factorization.

12121110212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70883685476 (or 70883685473 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12121110212121 its reverse (12121201112121), we get a palindrome (24242311324242).

The spelling of 12121110212121 in words is "twelve trillion, one hundred twenty-one billion, one hundred ten million, two hundred twelve thousand, one hundred twenty-one".