12001020210021 has 4 divisors (see below), whose sum is σ = 16001360280032. Its totient is φ = 8000680140012.

The previous prime is 12001020209999. The next prime is 12001020210031. The reversal of 12001020210021 is 12001202010021.

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 not a de Polignac number, because 12001020210021 - 2¹⁰ = 12001020208997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001020209979 and 12001020210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001020210031) 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, 2000170035001 + ... + 2000170035006.

It is an arithmetic number, because the mean of its divisors is an integer number (4000340070008).

Almost surely, 2^{12001020210021} is an apocalyptic number.

It is an amenable number.

12001020210021 is a deficient number, since it is larger than the sum of its proper divisors (4000340070011).

12001020210021 is an equidigital number, since it uses as much as digits as its factorization.

12001020210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000340070010.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12001020210021 its reverse (12001202010021), we get a palindrome (24002222220042).

The spelling of 12001020210021 in words is "twelve trillion, one billion, twenty million, two hundred ten thousand, twenty-one".