210221044902061 has 2 divisors, whose sum is σ = 210221044902062. Its totient is φ = 210221044902060.

The previous prime is 210221044901993. The next prime is 210221044902157. The reversal of 210221044902061 is 160209440122012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203960385360900 + 6260659541161 = 14281470^2 + 2502131^2 .

It is a cyclic number.

It is not a de Polignac number, because 210221044902061 - 2²¹ = 210221042804909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210221044902161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110522451030 + 105110522451031.

It is an arithmetic number, because the mean of its divisors is an integer number (105110522451031).

Almost surely, 2^{210221044902061} is an apocalyptic number.

It is an amenable number.

210221044902061 is a deficient number, since it is larger than the sum of its proper divisors (1).

210221044902061 is an equidigital number, since it uses as much as digits as its factorization.

210221044902061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 210221044902061 in words is "two hundred ten trillion, two hundred twenty-one billion, forty-four million, nine hundred two thousand, sixty-one".