212112161 has 2 divisors, whose sum is σ = 212112162. Its totient is φ = 212112160.
The previous prime is 212112091. The next prime is 212112167. The reversal of 212112161 is 161211212.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 199374400 + 12737761 = 14120^2 + 3569^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-212112161 is a prime.
It is not a weakly prime, because it can be changed into another prime (212112167) 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, 106056080 + 106056081.
It is an arithmetic number, because the mean of its divisors is an integer number (106056081).
Almost surely, 2212112161 is an apocalyptic number.
It is an amenable number.
212112161 is a deficient number, since it is larger than the sum of its proper divisors (1).
212112161 is an equidigital number, since it uses as much as digits as its factorization.
212112161 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 48, while the sum is 17.
The square root of 212112161 is about 14564.0708938126. The cubic root of 212112161 is about 596.3783322635.
Adding to 212112161 its reverse (161211212), we get a palindrome (373323373).
The spelling of 212112161 in words is "two hundred twelve million, one hundred twelve thousand, one hundred sixty-one".
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