212123030123 has 2 divisors, whose sum is σ = 212123030124. Its totient is φ = 212123030122.

The previous prime is 212123030111. The next prime is 212123030173. The reversal of 212123030123 is 321030321212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212123030123 - 2⁴ = 212123030107 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 212123030095 and 212123030104.

It is not a weakly prime, because it can be changed into another prime (212123030173) 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, 106061515061 + 106061515062.

It is an arithmetic number, because the mean of its divisors is an integer number (106061515062).

Almost surely, 2^212123030123 is an apocalyptic number.

212123030123 is a deficient number, since it is larger than the sum of its proper divisors (1).

212123030123 is an equidigital number, since it uses as much as digits as its factorization.

212123030123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 212123030123 its reverse (321030321212), we get a palindrome (533153351335).

The spelling of 212123030123 in words is "two hundred twelve billion, one hundred twenty-three million, thirty thousand, one hundred twenty-three".