12012001128 has 48 divisors (see below), whose sum is σ = 32659138980. Its totient is φ = 3988414464.

The previous prime is 12012001103. The next prime is 12012001129. The reversal of 12012001128 is 82110021021.

It can be written as a sum of positive squares in 2 ways, for example, as 11790050724 + 221950404 = 108582^2 + 14898^2 .

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 12012001128.

It is not an unprimeable number, because it can be changed into a prime (12012001129) 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 11 ways as a sum of consecutive naturals, for example, 306075 + ... + 343082.

Almost surely, 2^12012001128 is an apocalyptic number.

12012001128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12012001128 is an abundant number, since it is smaller than the sum of its proper divisors (20647137852).

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

12012001128 is a wasteful number, since it uses less digits than its factorization.

12012001128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649426 (or 649419 counting only the distinct ones).

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

Adding to 12012001128 its reverse (82110021021), we get a palindrome (94122022149).

The spelling of 12012001128 in words is "twelve billion, twelve million, one thousand, one hundred twenty-eight".