12128381235 has 32 divisors (see below), whose sum is σ = 21651840000. Its totient is φ = 6441388128.

The previous prime is 12128381201. The next prime is 12128381263. The reversal of 12128381235 is 53218382121.

12128381235 is a `hidden beast` number, since 1 + 21 + 28 + 381 + 235 = 666.

12128381235 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12128381235 - 2⁶ = 12128381171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12128381235.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155685 + ... + 220214.

It is an arithmetic number, because the mean of its divisors is an integer number (676620000).

Almost surely, 2^12128381235 is an apocalyptic number.

12128381235 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12128381235 is a deficient number, since it is larger than the sum of its proper divisors (9523458765).

12128381235 is a wasteful number, since it uses less digits than its factorization.

12128381235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376152 (or 376146 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The spelling of 12128381235 in words is "twelve billion, one hundred twenty-eight million, three hundred eighty-one thousand, two hundred thirty-five".