210221012002189 has 2 divisors, whose sum is σ = 210221012002190. Its totient is φ = 210221012002188.

The previous prime is 210221012002187. The next prime is 210221012002237. The reversal of 210221012002189 is 981200210122012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180878748079689 + 29342263922500 = 13449117^2 + 5416850^2 .

It is a cyclic number.

It is not a de Polignac number, because 210221012002189 - 2¹ = 210221012002187 is a prime.

Together with 210221012002187, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 210221012002189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210221012002187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110506001094 + 105110506001095.

It is an arithmetic number, because the mean of its divisors is an integer number (105110506001095).

Almost surely, 2^{210221012002189} is an apocalyptic number.

It is an amenable number.

210221012002189 is a deficient number, since it is larger than the sum of its proper divisors (1).

210221012002189 is an equidigital number, since it uses as much as digits as its factorization.

210221012002189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 210221012002189 in words is "two hundred ten trillion, two hundred twenty-one billion, twelve million, two thousand, one hundred eighty-nine".