212756213 has 2 divisors, whose sum is σ = 212756214. Its totient is φ = 212756212.

The previous prime is 212756161. The next prime is 212756293. The reversal of 212756213 is 312657212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109977169 + 102779044 = 10487^2 + 10138^2 .

It is a cyclic number.

It is not a de Polignac number, because 212756213 - 2⁶ = 212756149 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212756293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106378106 + 106378107.

It is an arithmetic number, because the mean of its divisors is an integer number (106378107).

Almost surely, 2^212756213 is an apocalyptic number.

It is an amenable number.

212756213 is a deficient number, since it is larger than the sum of its proper divisors (1).

212756213 is an equidigital number, since it uses as much as digits as its factorization.

212756213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 29.

The square root of 212756213 is about 14586.1651231569. The cubic root of 212756213 is about 596.9813317245.

Subtracting 212756213 from its reverse (312657212), we obtain a palindrome (99900999).

The spelling of 212756213 in words is "two hundred twelve million, seven hundred fifty-six thousand, two hundred thirteen".