210202021222121 has 2 divisors, whose sum is σ = 210202021222122. Its totient is φ = 210202021222120.

The previous prime is 210202021222097. The next prime is 210202021222133. The reversal of 210202021222121 is 121222120202012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171720345932521 + 38481675289600 = 13104211^2 + 6203360^2 .

It is a cyclic number.

It is not a de Polignac number, because 210202021222121 - 2⁶ = 210202021222057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210202021222093 and 210202021222102.

It is not a weakly prime, because it can be changed into another prime (210202021222181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105101010611060 + 105101010611061.

It is an arithmetic number, because the mean of its divisors is an integer number (105101010611061).

Almost surely, 2^{210202021222121} is an apocalyptic number.

It is an amenable number.

210202021222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210202021222121 is an equidigital number, since it uses as much as digits as its factorization.

210202021222121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 210202021222121 its reverse (121222120202012), we get a palindrome (331424141424133).

The spelling of 210202021222121 in words is "two hundred ten trillion, two hundred two billion, twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".