212221304 has 24 divisors (see below), whose sum is σ = 412122360. Its totient is φ = 102448416.

The previous prime is 212221277. The next prime is 212221327. The reversal of 212221304 is 403122212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9044 + ... + 22499.

It is an arithmetic number, because the mean of its divisors is an integer number (17171765).

Almost surely, 2^212221304 is an apocalyptic number.

It is an amenable number.

212221304 is a deficient number, since it is larger than the sum of its proper divisors (199901056).

212221304 is a wasteful number, since it uses less digits than its factorization.

212221304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31607 (or 31574 counting only the distinct ones).

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

The square root of 212221304 is about 14567.8174068733. The cubic root of 212221304 is about 596.4806041921.

Adding to 212221304 its reverse (403122212), we get a palindrome (615343516).

The spelling of 212221304 in words is "two hundred twelve million, two hundred twenty-one thousand, three hundred four".