210210110221081 has 2 divisors, whose sum is σ = 210210110221082. Its totient is φ = 210210110221080.

The previous prime is 210210110220977. The next prime is 210210110221129. The reversal of 210210110221081 is 180122011012012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127683423484681 + 82526686736400 = 11299709^2 + 9084420^2 .

It is a cyclic number.

It is not a de Polignac number, because 210210110221081 - 2¹⁵ = 210210110188313 is a prime.

It is a super-2 number, since 2×210210110221081² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (210210410221081) 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, 105105055110540 + 105105055110541.

It is an arithmetic number, because the mean of its divisors is an integer number (105105055110541).

Almost surely, 2^{210210110221081} is an apocalyptic number.

It is an amenable number.

210210110221081 is a deficient number, since it is larger than the sum of its proper divisors (1).

210210110221081 is an equidigital number, since it uses as much as digits as its factorization.

210210110221081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 22.

Adding to 210210110221081 its reverse (180122011012012), we get a palindrome (390332121233093).

The spelling of 210210110221081 in words is "two hundred ten trillion, two hundred ten billion, one hundred ten million, two hundred twenty-one thousand, eighty-one".