12001021200021 has 32 divisors (see below), whose sum is σ = 18310195990528. Its totient is φ = 6849131204160.

The previous prime is 12001021200019. The next prime is 12001021200023. The reversal of 12001021200021 is 12000212010021.

It is an interprime number because it is at equal distance from previous prime (12001021200019) and next prime (12001021200023).

It is not a de Polignac number, because 12001021200021 - 2¹ = 12001021200019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001021200023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174102855 + ... + 174171771.

It is an arithmetic number, because the mean of its divisors is an integer number (572193624704).

Almost surely, 2^{12001021200021} is an apocalyptic number.

It is an amenable number.

12001021200021 is a deficient number, since it is larger than the sum of its proper divisors (6309174790507).

12001021200021 is an equidigital number, since it uses as much as digits as its factorization.

12001021200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79201.

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

Adding to 12001021200021 its reverse (12000212010021), we get a palindrome (24001233210042).

The spelling of 12001021200021 in words is "twelve trillion, one billion, twenty-one million, two hundred thousand, twenty-one".