12057321478 has 4 divisors (see below), whose sum is σ = 18085982220. Its totient is φ = 6028660738.

The previous prime is 12057321469. The next prime is 12057321559. The reversal of 12057321478 is 87412375021.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12057321478.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3014330368 + ... + 3014330371.

It is an arithmetic number, because the mean of its divisors is an integer number (4521495555).

Almost surely, 2^12057321478 is an apocalyptic number.

12057321478 is a deficient number, since it is larger than the sum of its proper divisors (6028660742).

12057321478 is an equidigital number, since it uses as much as digits as its factorization.

12057321478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6028660741.

The product of its (nonzero) digits is 94080, while the sum is 40.

Adding to 12057321478 its reverse (87412375021), we get a palindrome (99469696499).

The spelling of 12057321478 in words is "twelve billion, fifty-seven million, three hundred twenty-one thousand, four hundred seventy-eight".