221210212 has 24 divisors (see below), whose sum is σ = 392666400. Its totient is φ = 109027776.

The previous prime is 221210207. The next prime is 221210243. The reversal of 221210212 is 212012122.

It is a happy number.

221210212 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221210192 and 221210201.

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, 148423 + ... + 149905.

It is an arithmetic number, because the mean of its divisors is an integer number (16361100).

Almost surely, 2^221210212 is an apocalyptic number.

It is an amenable number.

221210212 is a deficient number, since it is larger than the sum of its proper divisors (171456188).

221210212 is a wasteful number, since it uses less digits than its factorization.

221210212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995 (or 1993 counting only the distinct ones).

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

The square root of 221210212 is about 14873.1372615195. The cubic root of 221210212 is about 604.7859926547.

Adding to 221210212 its reverse (212012122), we get a palindrome (433222334).

The spelling of 221210212 in words is "two hundred twenty-one million, two hundred ten thousand, two hundred twelve".