213123030233 has 4 divisors (see below), whose sum is σ = 213726778548. Its totient is φ = 212519281920.

The previous prime is 213123030209. The next prime is 213123030271. The reversal of 213123030233 is 332030321312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56759727049 + 156363303184 = 238243^2 + 395428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213123030233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213123030199 and 213123030208.

It is not an unprimeable number, because it can be changed into a prime (213123030293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301873628 + ... + 301874333.

It is an arithmetic number, because the mean of its divisors is an integer number (53431694637).

Almost surely, 2^213123030233 is an apocalyptic number.

It is an amenable number.

213123030233 is a deficient number, since it is larger than the sum of its proper divisors (603748315).

213123030233 is an equidigital number, since it uses as much as digits as its factorization.

213123030233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603748314.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 213123030233 its reverse (332030321312), we get a palindrome (545153351545).

The spelling of 213123030233 in words is "two hundred thirteen billion, one hundred twenty-three million, thirty thousand, two hundred thirty-three".