12020002000021 has 4 divisors (see below), whose sum is σ = 12026220316492. Its totient is φ = 12013783683552.

The previous prime is 12020001999991. The next prime is 12020002000091. The reversal of 12020002000021 is 12000020002021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5211111921796 + 6808890078225 = 2282786^2 + 2609385^2 .

It is a cyclic number.

It is not a de Polignac number, because 12020002000021 - 2³¹ = 12017854516373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12020001999971 and 12020002000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020002000091) 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, 3109155336 + ... + 3109159201.

It is an arithmetic number, because the mean of its divisors is an integer number (3006555079123).

Almost surely, 2^{12020002000021} is an apocalyptic number.

It is an amenable number.

12020002000021 is a deficient number, since it is larger than the sum of its proper divisors (6218316471).

12020002000021 is an equidigital number, since it uses as much as digits as its factorization.

12020002000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6218316470.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 12020002000021 its reverse (12000020002021), we get a palindrome (24020022002042).

The spelling of 12020002000021 in words is "twelve trillion, twenty billion, two million, twenty-one", and thus it is an aban number and an uban number.