212128530 has 16 divisors (see below), whose sum is σ = 509108544. Its totient is φ = 56567600.

The previous prime is 212128519. The next prime is 212128573. The reversal of 212128530 is 35821212.

212128530 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 212128530.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3535446 + ... + 3535505.

It is an arithmetic number, because the mean of its divisors is an integer number (31819284).

Almost surely, 2^212128530 is an apocalyptic number.

212128530 is an abundant number, since it is smaller than the sum of its proper divisors (296980014).

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

212128530 is a wasteful number, since it uses less digits than its factorization.

212128530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070961.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 212128530 is about 14564.6328481016. The cubic root of 212128530 is about 596.3936729929.

Adding to 212128530 its reverse (35821212), we get a palindrome (247949742).

The spelling of 212128530 in words is "two hundred twelve million, one hundred twenty-eight thousand, five hundred thirty".