221210210 has 16 divisors (see below), whose sum is σ = 428807736. Its totient is φ = 81677568.

The previous prime is 221210207. The next prime is 221210243. The reversal of 221210210 is 12012122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 174847729 + 46362481 = 13223^2 + 6809^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221210191 and 221210200.

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, 850679 + ... + 850938.

Almost surely, 2^221210210 is an apocalyptic number.

221210210 is a deficient number, since it is larger than the sum of its proper divisors (207597526).

221210210 is a wasteful number, since it uses less digits than its factorization.

221210210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701637.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 221210210 is about 14873.1371942842. The cubic root of 221210210 is about 604.7859908321.

Adding to 221210210 its reverse (12012122), we get a palindrome (233222332).

The spelling of 221210210 in words is "two hundred twenty-one million, two hundred ten thousand, two hundred ten".