212102161 has 2 divisors, whose sum is σ = 212102162. Its totient is φ = 212102160.

The previous prime is 212102153. The next prime is 212102179. The reversal of 212102161 is 161201212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211411600 + 690561 = 14540^2 + 831^2 .

It is a cyclic number.

It is not a de Polignac number, because 212102161 - 2³ = 212102153 is a prime.

It is not a weakly prime, because it can be changed into another prime (212102861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106051080 + 106051081.

It is an arithmetic number, because the mean of its divisors is an integer number (106051081).

Almost surely, 2^212102161 is an apocalyptic number.

It is an amenable number.

212102161 is a deficient number, since it is larger than the sum of its proper divisors (1).

212102161 is an equidigital number, since it uses as much as digits as its factorization.

212102161 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 16.

The square root of 212102161 is about 14563.7275791605. The cubic root of 212102161 is about 596.3689600568.

Adding to 212102161 its reverse (161201212), we get a palindrome (373303373).

The spelling of 212102161 in words is "two hundred twelve million, one hundred two thousand, one hundred sixty-one".