221234210 has 8 divisors (see below), whose sum is σ = 398221596. Its totient is φ = 88493680.

The previous prime is 221234203. The next prime is 221234213. The reversal of 221234210 is 12432122.

It can be written as a sum of positive squares in 2 ways, for example, as 219128809 + 2105401 = 14803^2 + 1451^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221234213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11061701 + ... + 11061720.

Almost surely, 2^221234210 is an apocalyptic number.

221234210 is a deficient number, since it is larger than the sum of its proper divisors (176987386).

221234210 is a wasteful number, since it uses less digits than its factorization.

221234210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22123428.

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

The square root of 221234210 is about 14873.9439961296. The cubic root of 221234210 is about 604.8078619427.

Adding to 221234210 its reverse (12432122), we get a palindrome (233666332).

The spelling of 221234210 in words is "two hundred twenty-one million, two hundred thirty-four thousand, two hundred ten".