202100020021 has 16 divisors (see below), whose sum is σ = 217955586240. Its totient is φ = 186767614080.

The previous prime is 202100020019. The next prime is 202100020027. The reversal of 202100020021 is 120020001202.

202100020021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 202100020021 - 2¹ = 202100020019 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 (202100020027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7880806 + ... + 7906408.

It is an arithmetic number, because the mean of its divisors is an integer number (13622224140).

Almost surely, 2^202100020021 is an apocalyptic number.

It is an amenable number.

202100020021 is a deficient number, since it is larger than the sum of its proper divisors (15855566219).

202100020021 is a wasteful number, since it uses less digits than its factorization.

202100020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35796.

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

Adding to 202100020021 its reverse (120020001202), we get a palindrome (322120021223).

The spelling of 202100020021 in words is "two hundred two billion, one hundred million, twenty thousand, twenty-one".