12012112220121 has 24 divisors (see below), whose sum is σ = 18991827710856. Its totient is φ = 7270887594240.

The previous prime is 12012112220111. The next prime is 12012112220189. The reversal of 12012112220121 is 12102221121021.

It can be written as a sum of positive squares in 4 ways, for example, as 1808150855625 + 10203961364496 = 1344675^2 + 3194364^2 .

It is not a de Polignac number, because 12012112220121 - 2⁶ = 12012112220057 is a prime.

It is a super-3 number, since 3×12012112220121³ (a number of 40 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12012112220094 and 12012112220103.

It is not an unprimeable number, because it can be changed into a prime (12012112220111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 841530780 + ... + 841545053.

It is an arithmetic number, because the mean of its divisors is an integer number (791326154619).

Almost surely, 2^{12012112220121} is an apocalyptic number.

It is an amenable number.

12012112220121 is a deficient number, since it is larger than the sum of its proper divisors (6979715490735).

12012112220121 is a wasteful number, since it uses less digits than its factorization.

12012112220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683075913 (or 1683075910 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12012112220121 its reverse (12102221121021), we get a palindrome (24114333341142).

The spelling of 12012112220121 in words is "twelve trillion, twelve billion, one hundred twelve million, two hundred twenty thousand, one hundred twenty-one".