202201212221 has 2 divisors, whose sum is σ = 202201212222. Its totient is φ = 202201212220.

The previous prime is 202201212217. The next prime is 202201212223. The reversal of 202201212221 is 122212102202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157597884196 + 44603328025 = 396986^2 + 211195^2 .

It is a cyclic number.

It is not a de Polignac number, because 202201212221 - 2² = 202201212217 is a prime.

It is a Sophie Germain prime.

Together with 202201212223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 202201212221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202201212223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101100606110 + 101100606111.

It is an arithmetic number, because the mean of its divisors is an integer number (101100606111).

Almost surely, 2^202201212221 is an apocalyptic number.

It is an amenable number.

202201212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202201212221 is an equidigital number, since it uses as much as digits as its factorization.

202201212221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 202201212221 its reverse (122212102202), we get a palindrome (324413314423).

The spelling of 202201212221 in words is "two hundred two billion, two hundred one million, two hundred twelve thousand, two hundred twenty-one".