221303210 has 8 divisors (see below), whose sum is σ = 398345796. Its totient is φ = 88521280.

The previous prime is 221303209. The next prime is 221303227. The reversal of 221303210 is 12303122.

It is a happy number.

221303210 is digitally balanced in base 3, 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 2 ways, for example, as 203604361 + 17698849 = 14269^2 + 4207^2 .

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

It is a super-2 number, since 2×221303210² = 97950221512608200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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, 11065151 + ... + 11065170.

Almost surely, 2^221303210 is an apocalyptic number.

221303210 is a deficient number, since it is larger than the sum of its proper divisors (177042586).

221303210 is a wasteful number, since it uses less digits than its factorization.

221303210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22130328.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 221303210 is about 14876.2633076993. The cubic root of 221303210 is about 604.8707325760.

Adding to 221303210 its reverse (12303122), we get a palindrome (233606332).

The spelling of 221303210 in words is "two hundred twenty-one million, three hundred three thousand, two hundred ten".