202100222221 has 4 divisors (see below), whose sum is σ = 203268431772. Its totient is φ = 200932012672.

The previous prime is 202100222189. The next prime is 202100222227. The reversal of 202100222221 is 122222001202.

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 82739646025 + 119360576196 = 287645^2 + 345486^2 .

It is a cyclic number.

It is not a de Polignac number, because 202100222221 - 2⁵ = 202100222189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202100222195 and 202100222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202100222227) 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, 584104516 + ... + 584104861.

It is an arithmetic number, because the mean of its divisors is an integer number (50817107943).

Almost surely, 2^202100222221 is an apocalyptic number.

It is an amenable number.

202100222221 is a deficient number, since it is larger than the sum of its proper divisors (1168209551).

202100222221 is a wasteful number, since it uses less digits than its factorization.

202100222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168209550.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 202100222221 its reverse (122222001202), we get a palindrome (324322223423).

The spelling of 202100222221 in words is "two hundred two billion, one hundred million, two hundred twenty-two thousand, two hundred twenty-one".