12000010021 has 4 divisors (see below), whose sum is σ = 12413803500. Its totient is φ = 11586216544.

The previous prime is 12000010013. The next prime is 12000010109. The reversal of 12000010021 is 12001000021.

12000010021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12001000021 = 163 ⋅73625767.

It can be written as a sum of positive squares in 2 ways, for example, as 10078152100 + 1921857921 = 100390^2 + 43839^2 .

It is a cyclic number.

It is not a de Polignac number, because 12000010021 - 2³ = 12000010013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12000009986 and 12000010013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000010721) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 206896696 + ... + 206896753.

It is an arithmetic number, because the mean of its divisors is an integer number (3103450875).

Almost surely, 2^12000010021 is an apocalyptic number.

It is an amenable number.

12000010021 is a deficient number, since it is larger than the sum of its proper divisors (413793479).

12000010021 is an equidigital number, since it uses as much as digits as its factorization.

12000010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413793478.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 12000010021 its reverse (12001000021), we get a palindrome (24001010042).

The spelling of 12000010021 in words is "twelve billion, ten thousand, twenty-one".