210211221201161 has 2 divisors, whose sum is σ = 210211221201162. Its totient is φ = 210211221201160.

The previous prime is 210211221201133. The next prime is 210211221201203. The reversal of 210211221201161 is 161102122112012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167113637435536 + 43097583765625 = 12927244^2 + 6564875^2 .

It is a cyclic number.

It is not a de Polignac number, because 210211221201161 - 2¹⁸ = 210211220939017 is a prime.

It is not a weakly prime, because it can be changed into another prime (210211221207161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105105610600580 + 105105610600581.

It is an arithmetic number, because the mean of its divisors is an integer number (105105610600581).

Almost surely, 2^{210211221201161} is an apocalyptic number.

It is an amenable number.

210211221201161 is a deficient number, since it is larger than the sum of its proper divisors (1).

210211221201161 is an equidigital number, since it uses as much as digits as its factorization.

210211221201161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 23.

Adding to 210211221201161 its reverse (161102122112012), we get a palindrome (371313343313173).

The spelling of 210211221201161 in words is "two hundred ten trillion, two hundred eleven billion, two hundred twenty-one million, two hundred one thousand, one hundred sixty-one".