12012011028 has 108 divisors (see below), whose sum is σ = 32512410112. Its totient is φ = 3738389760.

The previous prime is 12012011023. The next prime is 12012011029. The reversal of 12012011028 is 82011021021.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 12012011028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012011021) 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 35 ways as a sum of consecutive naturals, for example, 1316763 + ... + 1325853.

Almost surely, 2^12012011028 is an apocalyptic number.

12012011028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12012011028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16256205056).

12012011028 is an abundant number, since it is smaller than the sum of its proper divisors (20500399084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12012011028 is a wasteful number, since it uses less digits than its factorization.

12012011028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9262 (or 9240 counting only the distinct ones).

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

Adding to 12012011028 its reverse (82011021021), we get a palindrome (94023032049).

The spelling of 12012011028 in words is "twelve billion, twelve million, eleven thousand, twenty-eight".