213123103112 has 16 divisors (see below), whose sum is σ = 404095772700. Its totient is φ = 105364230400.

The previous prime is 213123103103. The next prime is 213123103117. The reversal of 213123103112 is 211301321312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 187684767076 + 25438336036 = 433226^2 + 159494^2 .

It is not an unprimeable number, because it can be changed into a prime (213123103117) 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 in 3 ways as a sum of consecutive naturals, for example, 149664389 + ... + 149665812.

Almost surely, 2^213123103112 is an apocalyptic number.

It is an amenable number.

213123103112 is a deficient number, since it is larger than the sum of its proper divisors (190972669588).

213123103112 is a wasteful number, since it uses less digits than its factorization.

213123103112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299330296 (or 299330292 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 213123103112 its reverse (211301321312), we get a palindrome (424424424424).

The spelling of 213123103112 in words is "two hundred thirteen billion, one hundred twenty-three million, one hundred three thousand, one hundred twelve".