12121111012 has 12 divisors (see below), whose sum is σ = 21321852076. Its totient is φ = 6029153280.

The previous prime is 12121111007. The next prime is 12121111019. The reversal of 12121111012 is 21011112121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8666492836 + 3454618176 = 93094^2 + 58776^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12121110983 and 12121111001.

It is not an unprimeable number, because it can be changed into a prime (12121111019) 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, 7849689 + ... + 7851232.

Almost surely, 2^12121111012 is an apocalyptic number.

It is an amenable number.

12121111012 is a deficient number, since it is larger than the sum of its proper divisors (9200741064).

12121111012 is a wasteful number, since it uses less digits than its factorization.

12121111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15701118 (or 15701116 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12121111012 its reverse (21011112121), we get a palindrome (33132223133).

The spelling of 12121111012 in words is "twelve billion, one hundred twenty-one million, one hundred eleven thousand, twelve".