221510242 has 8 divisors (see below), whose sum is σ = 332978256. Its totient is φ = 110517492.

The previous prime is 221510213. The next prime is 221510257. The reversal of 221510242 is 242015122.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117648 + ... + 119515.

It is an arithmetic number, because the mean of its divisors is an integer number (41622282).

Almost surely, 2^221510242 is an apocalyptic number.

221510242 is a deficient number, since it is larger than the sum of its proper divisors (111468014).

221510242 is a wasteful number, since it uses less digits than its factorization.

221510242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237632.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 221510242 is about 14883.2201488791. The cubic root of 221510242 is about 605.0592952379.

Adding to 221510242 its reverse (242015122), we get a palindrome (463525364).

The spelling of 221510242 in words is "two hundred twenty-one million, five hundred ten thousand, two hundred forty-two".