202021020121 has 2 divisors, whose sum is σ = 202021020122. Its totient is φ = 202021020120.

The previous prime is 202021020109. The next prime is 202021020199. The reversal of 202021020121 is 121020120202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133868174400 + 68152845721 = 365880^2 + 261061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202021020121 is a prime.

It is not a weakly prime, because it can be changed into another prime (202021020101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101010510060 + 101010510061.

It is an arithmetic number, because the mean of its divisors is an integer number (101010510061).

Almost surely, 2^202021020121 is an apocalyptic number.

It is an amenable number.

202021020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

202021020121 is an equidigital number, since it uses as much as digits as its factorization.

202021020121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 202021020121 its reverse (121020120202), we get a palindrome (323041140323).

The spelling of 202021020121 in words is "two hundred two billion, twenty-one million, twenty thousand, one hundred twenty-one".