213123512 has 64 divisors (see below), whose sum is σ = 474163200. Its totient is φ = 87880320.

The previous prime is 213123511. The next prime is 213123539. The reversal of 213123512 is 215321312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213123511) 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, 508439 + ... + 508857.

It is an arithmetic number, because the mean of its divisors is an integer number (7408800).

Almost surely, 2^213123512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213123512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237081600).

213123512 is an abundant number, since it is smaller than the sum of its proper divisors (261039688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213123512 is a wasteful number, since it uses less digits than its factorization.

213123512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756 (or 752 counting only the distinct ones).

The product of its digits is 360, while the sum is 20.

The square root of 213123512 is about 14598.7503574792. The cubic root of 213123512 is about 597.3246739661.

Adding to 213123512 its reverse (215321312), we get a palindrome (428444824).

The spelling of 213123512 in words is "two hundred thirteen million, one hundred twenty-three thousand, five hundred twelve".