20002112200021 has 6 divisors (see below), whose sum is σ = 23267763171510. Its totient is φ = 17144667599976.

The previous prime is 20002112200003. The next prime is 20002112200061. The reversal of 20002112200021 is 12000221120002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15344565521796 + 4657546678225 = 3917214^2 + 2158135^2 .

It is not a de Polignac number, because 20002112200021 - 2⁴¹ = 17803088944469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002112199974 and 20002112200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002112200001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 204103185666 + ... + 204103185763.

It is an arithmetic number, because the mean of its divisors is an integer number (3877960528585).

Almost surely, 2^{20002112200021} is an apocalyptic number.

It is an amenable number.

20002112200021 is a deficient number, since it is larger than the sum of its proper divisors (3265650971489).

20002112200021 is an equidigital number, since it uses as much as digits as its factorization.

20002112200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408206371443 (or 408206371436 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20002112200021 its reverse (12000221120002), we get a palindrome (32002333320023).

The spelling of 20002112200021 in words is "twenty trillion, two billion, one hundred twelve million, two hundred thousand, twenty-one".