212161 has 2 divisors, whose sum is σ = 212162. Its totient is φ = 212160.

The previous prime is 212141. The next prime is 212167. The reversal of 212161 is 161212.

212161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207936 + 4225 = 456^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 212161 - 2¹¹ = 210113 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (212167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106080 + 106081.

It is an arithmetic number, because the mean of its divisors is an integer number (106081).

2²¹²¹⁶¹ is an apocalyptic number.

It is an amenable number.

212161 is a deficient number, since it is larger than the sum of its proper divisors (1).

212161 is an equidigital number, since it uses as much as digits as its factorization.

212161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24, while the sum is 13.

The square root of 212161 is about 460.6093789753. The cubic root of 212161 is about 59.6424100952.

Adding to 212161 its reverse (161212), we get a palindrome (373373).

It can be divided in two parts, 212 and 161, that added together give a palindrome (373).

The spelling of 212161 in words is "two hundred twelve thousand, one hundred sixty-one".