210203300221261 has 2 divisors, whose sum is σ = 210203300221262. Its totient is φ = 210203300221260.

The previous prime is 210203300221259. The next prime is 210203300221399. The reversal of 210203300221261 is 162122003302012.

210203300221261 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., 149194156824036 + 61009143397225 = 12214506^2 + 7810835^2 .

It is a cyclic number.

It is not a de Polignac number, because 210203300221261 - 2¹ = 210203300221259 is a prime.

Together with 210203300221259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210203300251261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105101650110630 + 105101650110631.

It is an arithmetic number, because the mean of its divisors is an integer number (105101650110631).

Almost surely, 2^{210203300221261} is an apocalyptic number.

It is an amenable number.

210203300221261 is a deficient number, since it is larger than the sum of its proper divisors (1).

210203300221261 is an equidigital number, since it uses as much as digits as its factorization.

210203300221261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 210203300221261 its reverse (162122003302012), we get a palindrome (372325303523273).

The spelling of 210203300221261 in words is "two hundred ten trillion, two hundred three billion, three hundred million, two hundred twenty-one thousand, two hundred sixty-one".