212123012117 has 2 divisors, whose sum is σ = 212123012118. Its totient is φ = 212123012116.

The previous prime is 212123012107. The next prime is 212123012147. The reversal of 212123012117 is 711210321212.

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., 115845610321 + 96277401796 = 340361^2 + 310286^2 .

It is a cyclic number.

It is not a de Polignac number, because 212123012117 - 2²⁶ = 212055903253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212123012092 and 212123012101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212123012107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106061506058 + 106061506059.

It is an arithmetic number, because the mean of its divisors is an integer number (106061506059).

Almost surely, 2^212123012117 is an apocalyptic number.

It is an amenable number.

212123012117 is a deficient number, since it is larger than the sum of its proper divisors (1).

212123012117 is an equidigital number, since it uses as much as digits as its factorization.

212123012117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 212123012117 its reverse (711210321212), we get a palindrome (923333333329).

The spelling of 212123012117 in words is "two hundred twelve billion, one hundred twenty-three million, twelve thousand, one hundred seventeen".