12001012021 has 4 divisors (see below), whose sum is σ = 12002241600. Its totient is φ = 11999782444.

The previous prime is 12001011991. The next prime is 12001012031. The reversal of 12001012021 is 12021010021.

12001012021 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12021010021 = 7537 ⋅1594933.

It is a cyclic number.

It is not a de Polignac number, because 12001012021 - 2⁹ = 12001011509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001011989 and 12001012007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001012031) 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, 600031 + ... + 619708.

It is an arithmetic number, because the mean of its divisors is an integer number (3000560400).

Almost surely, 2^12001012021 is an apocalyptic number.

It is an amenable number.

12001012021 is a deficient number, since it is larger than the sum of its proper divisors (1229579).

12001012021 is an equidigital number, since it uses as much as digits as its factorization.

12001012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229578.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 12001012021 its reverse (12021010021), we get a palindrome (24022022042).

The spelling of 12001012021 in words is "twelve billion, one million, twelve thousand, twenty-one".