12001022021 has 4 divisors (see below), whose sum is σ = 12004024032. Its totient is φ = 11998020012.

The previous prime is 12001021999. The next prime is 12001022029. The reversal of 12001022021 is 12022010021.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 12001022021 - 2¹⁴ = 12001005637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12001021993 and 12001022011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001022029) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1495001 + ... + 1503006.

It is an arithmetic number, because the mean of its divisors is an integer number (3001006008).

Almost surely, 2^12001022021 is an apocalyptic number.

It is an amenable number.

12001022021 is a deficient number, since it is larger than the sum of its proper divisors (3002011).

12001022021 is an equidigital number, since it uses as much as digits as its factorization.

12001022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3002010.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12001022021 its reverse (12022010021), we get a palindrome (24023032042).

The spelling of 12001022021 in words is "twelve billion, one million, twenty-two thousand, twenty-one".