221040242 has 8 divisors (see below), whose sum is σ = 331636656. Its totient is φ = 110494692.

The previous prime is 221040241. The next prime is 221040247. The reversal of 221040242 is 242040122.

It is a happy number.

221040242 is digitally balanced in base 3, 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 a self number, because there is not a number n which added to its sum of digits gives 221040242.

It is not an unprimeable number, because it can be changed into a prime (221040241) 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, 1193 + ... + 21059.

It is an arithmetic number, because the mean of its divisors is an integer number (41454582).

Almost surely, 2^221040242 is an apocalyptic number.

221040242 is a deficient number, since it is larger than the sum of its proper divisors (110596414).

221040242 is a wasteful number, since it uses less digits than its factorization.

221040242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25432.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 221040242 is about 14867.4221706387. The cubic root of 221040242 is about 604.6310543367.

Adding to 221040242 its reverse (242040122), we get a palindrome (463080364).

The spelling of 221040242 in words is "two hundred twenty-one million, forty thousand, two hundred forty-two".