212081 has 2 divisors, whose sum is σ = 212082. Its totient is φ = 212080.

The previous prime is 212057. The next prime is 212099. The reversal of 212081 is 180212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112225 + 99856 = 335^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 212081 - 2¹⁴ = 195697 is a prime.

It is a super-2 number, since 2×212081² = 89956701122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (212281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106040 + 106041.

It is an arithmetic number, because the mean of its divisors is an integer number (106041).

2²¹²⁰⁸¹ is an apocalyptic number.

It is an amenable number.

212081 is a deficient number, since it is larger than the sum of its proper divisors (1).

212081 is an equidigital number, since it uses as much as digits as its factorization.

212081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 212081 is about 460.5225293077. The cubic root of 212081 is about 59.6349126559.

Adding to 212081 its reverse (180212), we get a palindrome (392293).

The spelling of 212081 in words is "two hundred twelve thousand, eighty-one".