202100020221 has 24 divisors (see below), whose sum is σ = 305745217792. Its totient is φ = 118533729600.

The previous prime is 202100020207. The next prime is 202100020273. The reversal of 202100020221 is 122020001202.

It is not a de Polignac number, because 202100020221 - 2⁷ = 202100020093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 202100020197 and 202100020206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202100020621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8968576 + ... + 8991081.

Almost surely, 2^202100020221 is an apocalyptic number.

It is an amenable number.

202100020221 is a deficient number, since it is larger than the sum of its proper divisors (103645197571).

202100020221 is a wasteful number, since it uses less digits than its factorization.

202100020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17959713 (or 17959702 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 202100020221 its reverse (122020001202), we get a palindrome (324120021423).

The spelling of 202100020221 in words is "two hundred two billion, one hundred million, twenty thousand, two hundred twenty-one".