212130321 has 36 divisors (see below), whose sum is σ = 314388144. Its totient is φ = 127152480.

The previous prime is 212130313. The next prime is 212130337. The reversal of 212130321 is 123031212.

It is not a de Polignac number, because 212130321 - 2³ = 212130313 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212130321.

It is not an unprimeable number, because it can be changed into a prime (212230321) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2555746 + ... + 2555828.

It is an arithmetic number, because the mean of its divisors is an integer number (8733004).

Almost surely, 2^212130321 is an apocalyptic number.

It is an amenable number.

212130321 is a deficient number, since it is larger than the sum of its proper divisors (102257823).

212130321 is an equidigital number, since it uses as much as digits as its factorization.

212130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 212130321 is about 14564.6943325289. The cubic root of 212130321 is about 596.3953514377.

Adding to 212130321 its reverse (123031212), we get a palindrome (335161533).

The spelling of 212130321 in words is "two hundred twelve million, one hundred thirty thousand, three hundred twenty-one".