12012121012 has 12 divisors (see below), whose sum is σ = 21083591620. Its totient is φ = 5988237696.

The previous prime is 12012121007. The next prime is 12012121039. The reversal of 12012121012 is 21012121021.

It can be written as a sum of positive squares in 2 ways, for example, as 4634341776 + 7377779236 = 68076^2 + 85894^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12012120983 and 12012121001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4454187 + ... + 4456882.

Almost surely, 2^12012121012 is an apocalyptic number.

It is an amenable number.

12012121012 is a deficient number, since it is larger than the sum of its proper divisors (9071470608).

12012121012 is a wasteful number, since it uses less digits than its factorization.

12012121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8911410 (or 8911408 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12012121012 its reverse (21012121021), we get a palindrome (33024242033).

Subtracting 12012121012 from its reverse (21012121021), we obtain a palindrome (9000000009).

The spelling of 12012121012 in words is "twelve billion, twelve million, one hundred twenty-one thousand, twelve".