212116393 has 2 divisors, whose sum is σ = 212116394. Its totient is φ = 212116392.

The previous prime is 212116381. The next prime is 212116397. The reversal of 212116393 is 393611212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157828969 + 54287424 = 12563^2 + 7368^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212116393 is a prime.

It is not a weakly prime, because it can be changed into another prime (212116397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106058196 + 106058197.

It is an arithmetic number, because the mean of its divisors is an integer number (106058197).

Almost surely, 2^212116393 is an apocalyptic number.

It is an amenable number.

212116393 is a deficient number, since it is larger than the sum of its proper divisors (1).

212116393 is an equidigital number, since it uses as much as digits as its factorization.

212116393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The square root of 212116393 is about 14564.2161821363. The cubic root of 212116393 is about 596.3822984927.

The spelling of 212116393 in words is "two hundred twelve million, one hundred sixteen thousand, three hundred ninety-three".