20002112021 has 4 divisors (see below), whose sum is σ = 20002411500. Its totient is φ = 20001812544.

The previous prime is 20002112017. The next prime is 20002112057. The reversal of 20002112021 is 12021120002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12881115025 + 7120996996 = 113495^2 + 84386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002112021 - 2² = 20002112017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002111993 and 20002112011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002112521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085 + ... + 200013.

It is an arithmetic number, because the mean of its divisors is an integer number (5000602875).

Almost surely, 2^20002112021 is an apocalyptic number.

It is an amenable number.

20002112021 is a deficient number, since it is larger than the sum of its proper divisors (299479).

20002112021 is a wasteful number, since it uses less digits than its factorization.

20002112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299478.

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

Adding to 20002112021 its reverse (12021120002), we get a palindrome (32023232023).

The spelling of 20002112021 in words is "twenty billion, two million, one hundred twelve thousand, twenty-one".