221030221 has 8 divisors (see below), whose sum is σ = 228541824. Its totient is φ = 213619680.

The previous prime is 221030179. The next prime is 221030231. The reversal of 221030221 is 122030122.

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

It is a cyclic number.

It is not a de Polignac number, because 221030221 - 2⁹ = 221029709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221030231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20805 + ... + 29578.

It is an arithmetic number, because the mean of its divisors is an integer number (28567728).

Almost surely, 2^221030221 is an apocalyptic number.

It is an amenable number.

221030221 is a deficient number, since it is larger than the sum of its proper divisors (7511603).

221030221 is a wasteful number, since it uses less digits than its factorization.

221030221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50531.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 221030221 is about 14867.0851547975. The cubic root of 221030221 is about 604.6219170875.

Adding to 221030221 its reverse (122030122), we get a palindrome (343060343).

Subtracting from 221030221 its reverse (122030122), we obtain a palindrome (99000099).

The spelling of 221030221 in words is "two hundred twenty-one million, thirty thousand, two hundred twenty-one".