202013221721 has 2 divisors, whose sum is σ = 202013221722. Its totient is φ = 202013221720.

The previous prime is 202013221651. The next prime is 202013221741. The reversal of 202013221721 is 127122310202.

202013221721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177716206096 + 24297015625 = 421564^2 + 155875^2 .

It is a cyclic number.

It is not a de Polignac number, because 202013221721 - 2¹⁴ = 202013205337 is a prime.

It is not a weakly prime, because it can be changed into another prime (202013221741) 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, 101006610860 + 101006610861.

It is an arithmetic number, because the mean of its divisors is an integer number (101006610861).

Almost surely, 2^202013221721 is an apocalyptic number.

It is an amenable number.

202013221721 is a deficient number, since it is larger than the sum of its proper divisors (1).

202013221721 is an equidigital number, since it uses as much as digits as its factorization.

202013221721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

Adding to 202013221721 its reverse (127122310202), we get a palindrome (329135531923).

The spelling of 202013221721 in words is "two hundred two billion, thirteen million, two hundred twenty-one thousand, seven hundred twenty-one".