213123530 has 32 divisors (see below), whose sum is σ = 388067328. Its totient is φ = 84268800.

The previous prime is 213123511. The next prime is 213123539. The reversal of 213123530 is 35321312.

213123530 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213123539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460079 + ... + 460541.

It is an arithmetic number, because the mean of its divisors is an integer number (12127104).

Almost surely, 2^213123530 is an apocalyptic number.

213123530 is a deficient number, since it is larger than the sum of its proper divisors (174943798).

213123530 is a wasteful number, since it uses less digits than its factorization.

213123530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 213123530 is about 14598.7509739703. The cubic root of 213123530 is about 597.3246907824.

Adding to 213123530 its reverse (35321312), we get a palindrome (248444842).

It can be divided in two parts, 21312 and 3530, that added together give a palindrome (24842).

The spelling of 213123530 in words is "two hundred thirteen million, one hundred twenty-three thousand, five hundred thirty".