212221210 has 16 divisors (see below), whose sum is σ = 382214376. Its totient is φ = 84840448.

The previous prime is 212221181. The next prime is 212221223. The reversal of 212221210 is 12122212.

It is a happy number.

212221210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 106151809 + 106069401 = 10303^2 + 10299^2 .

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, 16602 + ... + 26458.

Almost surely, 2^212221210 is an apocalyptic number.

212221210 is a deficient number, since it is larger than the sum of its proper divisors (169993166).

212221210 is a wasteful number, since it uses less digits than its factorization.

212221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12017.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 212221210 is about 14567.8141805832. The cubic root of 212221210 is about 596.4805161249.

Adding to 212221210 its reverse (12122212), we get a palindrome (224343422).

It can be divided in two parts, 2122 and 21210, that added together give a palindrome (23332).

The spelling of 212221210 in words is "two hundred twelve million, two hundred twenty-one thousand, two hundred ten".