212006321 has 4 divisors (see below), whose sum is σ = 212040192. Its totient is φ = 211972452.

The previous prime is 212006309. The next prime is 212006329. The reversal of 212006321 is 123600212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212006321 - 2⁶ = 212006257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212006321.

It is not an unprimeable number, because it can be changed into a prime (212006329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4505 + ... + 21078.

It is an arithmetic number, because the mean of its divisors is an integer number (53010048).

Almost surely, 2^212006321 is an apocalyptic number.

It is an amenable number.

212006321 is a deficient number, since it is larger than the sum of its proper divisors (33871).

212006321 is an equidigital number, since it uses as much as digits as its factorization.

212006321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33870.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 212006321 is about 14560.4368409742. The cubic root of 212006321 is about 596.2791218835.

Adding to 212006321 its reverse (123600212), we get a palindrome (335606533).

The spelling of 212006321 in words is "two hundred twelve million, six thousand, three hundred twenty-one".