202113201221 has 2 divisors, whose sum is σ = 202113201222. Its totient is φ = 202113201220.

The previous prime is 202113201211. The next prime is 202113201239. The reversal of 202113201221 is 122102311202.

202113201221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197504692225 + 4608508996 = 444415^2 + 67886^2 .

It is a cyclic number.

It is not a de Polignac number, because 202113201221 - 2¹⁴ = 202113184837 is a prime.

It is a super-2 number, since 2×202113201221² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain 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 202113201221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202113201211) 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 as a sum of consecutive naturals, namely, 101056600610 + 101056600611.

It is an arithmetic number, because the mean of its divisors is an integer number (101056600611).

Almost surely, 2^202113201221 is an apocalyptic number.

It is an amenable number.

202113201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202113201221 is an equidigital number, since it uses as much as digits as its factorization.

202113201221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 202113201221 its reverse (122102311202), we get a palindrome (324215512423).

The spelling of 202113201221 in words is "two hundred two billion, one hundred thirteen million, two hundred one thousand, two hundred twenty-one".