221530210 has 16 divisors (see below), whose sum is σ = 435004992. Its totient is φ = 80556400.

The previous prime is 221530201. The next prime is 221530229. The reversal of 221530210 is 12035122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1006846 + ... + 1007065.

It is an arithmetic number, because the mean of its divisors is an integer number (27187812).

Almost surely, 2^221530210 is an apocalyptic number.

221530210 is a deficient number, since it is larger than the sum of its proper divisors (213474782).

221530210 is a wasteful number, since it uses less digits than its factorization.

221530210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013929.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 221530210 is about 14883.8909563326. The cubic root of 221530210 is about 605.0774756779.

Adding to 221530210 its reverse (12035122), we get a palindrome (233565332).

The spelling of 221530210 in words is "two hundred twenty-one million, five hundred thirty thousand, two hundred ten".