212204321 has 16 divisors (see below), whose sum is σ = 245606400. Its totient is φ = 179590608.

The previous prime is 212204273. The next prime is 212204327. The reversal of 212204321 is 123402212.

It is a cyclic number.

It is not a de Polignac number, because 212204321 - 2¹⁰ = 212203297 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 212204321.

It is not an unprimeable number, because it can be changed into a prime (212204327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203720 + ... + 204758.

It is an arithmetic number, because the mean of its divisors is an integer number (15350400).

Almost surely, 2^212204321 is an apocalyptic number.

It is an amenable number.

212204321 is a deficient number, since it is larger than the sum of its proper divisors (33402079).

212204321 is a wasteful number, since it uses less digits than its factorization.

212204321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 212204321 is about 14567.2345007555. The cubic root of 212204321 is about 596.4646926567.

Adding to 212204321 its reverse (123402212), we get a palindrome (335606533).

The spelling of 212204321 in words is "two hundred twelve million, two hundred four thousand, three hundred twenty-one".