221030642 has 8 divisors (see below), whose sum is σ = 378909696. Its totient is φ = 94727412.

The previous prime is 221030639. The next prime is 221030647. The reversal of 221030642 is 246030122.

221030642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (221030647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7893938 + ... + 7893965.

It is an arithmetic number, because the mean of its divisors is an integer number (47363712).

Almost surely, 2^221030642 is an apocalyptic number.

221030642 is a deficient number, since it is larger than the sum of its proper divisors (157879054).

221030642 is a wasteful number, since it uses less digits than its factorization.

221030642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15787912.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 221030642 is about 14867.0993135850. The cubic root of 221030642 is about 604.6223009651.

Adding to 221030642 its reverse (246030122), we get a palindrome (467060764).

The spelling of 221030642 in words is "two hundred twenty-one million, thirty thousand, six hundred forty-two".