210021210111161 has 2 divisors, whose sum is σ = 210021210111162. Its totient is φ = 210021210111160.

The previous prime is 210021210111137. The next prime is 210021210111347. The reversal of 210021210111161 is 161111012120012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114237191712400 + 95784018398761 = 10688180^2 + 9786931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021210111161 is a prime.

It is not a weakly prime, because it can be changed into another prime (210021210111101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010605055580 + 105010605055581.

It is an arithmetic number, because the mean of its divisors is an integer number (105010605055581).

Almost surely, 2^{210021210111161} is an apocalyptic number.

It is an amenable number.

210021210111161 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021210111161 is an equidigital number, since it uses as much as digits as its factorization.

210021210111161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 20.

Adding to 210021210111161 its reverse (161111012120012), we get a palindrome (371132222231173).

The spelling of 210021210111161 in words is "two hundred ten trillion, twenty-one billion, two hundred ten million, one hundred eleven thousand, one hundred sixty-one".