221540042 has 8 divisors (see below), whose sum is σ = 340038336. Its totient is φ = 108193932.

The previous prime is 221540027. The next prime is 221540047. The reversal of 221540042 is 240045122.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 221539996 and 221540023.

It is not an unprimeable number, because it can be changed into a prime (221540047) 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, 1287938 + ... + 1288109.

It is an arithmetic number, because the mean of its divisors is an integer number (42504792).

Almost surely, 2^221540042 is an apocalyptic number.

221540042 is a deficient number, since it is larger than the sum of its proper divisors (118498294).

221540042 is a wasteful number, since it uses less digits than its factorization.

221540042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576092.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 221540042 is about 14884.2212426448. The cubic root of 221540042 is about 605.0864271037.

Adding to 221540042 its reverse (240045122), we get a palindrome (461585164).

The spelling of 221540042 in words is "two hundred twenty-one million, five hundred forty thousand, forty-two".