12028013040821 has 4 divisors (see below), whose sum is σ = 12028341451500. Its totient is φ = 12027684630144.

The previous prime is 12028013040811. The next prime is 12028013040839. The reversal of 12028013040821 is 12804031082021.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10779238080625 + 1248774960196 = 3283175^2 + 1117486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12028013040821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12028013040811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164150396 + ... + 164223653.

It is an arithmetic number, because the mean of its divisors is an integer number (3007085362875).

Almost surely, 2^{12028013040821} is an apocalyptic number.

It is an amenable number.

12028013040821 is a deficient number, since it is larger than the sum of its proper divisors (328410679).

12028013040821 is an equidigital number, since it uses as much as digits as its factorization.

12028013040821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328410678.

The product of its (nonzero) digits is 6144, while the sum is 32.

The spelling of 12028013040821 in words is "twelve trillion, twenty-eight billion, thirteen million, forty thousand, eight hundred twenty-one".