212345123 has 2 divisors, whose sum is σ = 212345124. Its totient is φ = 212345122.

The previous prime is 212345093. The next prime is 212345171. The reversal of 212345123 is 321543212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212345123 - 2¹² = 212341027 is a prime.

It is not a weakly prime, because it can be changed into another prime (212345173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106172561 + 106172562.

It is an arithmetic number, because the mean of its divisors is an integer number (106172562).

Almost surely, 2^212345123 is an apocalyptic number.

212345123 is a deficient number, since it is larger than the sum of its proper divisors (1).

212345123 is an equidigital number, since it uses as much as digits as its factorization.

212345123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 23.

The square root of 212345123 is about 14572.0665315528. The cubic root of 212345123 is about 596.5965857511.

Adding to 212345123 its reverse (321543212), we get a palindrome (533888335).

The spelling of 212345123 in words is "two hundred twelve million, three hundred forty-five thousand, one hundred twenty-three".