221041242 has 96 divisors (see below), whose sum is σ = 527072832. Its totient is φ = 66673152.

The previous prime is 221041237. The next prime is 221041267. The reversal of 221041242 is 242140122.

221041242 is a `hidden beast` number, since 2 + 210 + 412 + 42 = 666.

221041242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1407828 + ... + 1407984.

It is an arithmetic number, because the mean of its divisors is an integer number (5490342).

Almost surely, 2^221041242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221041242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263536416).

221041242 is an abundant number, since it is smaller than the sum of its proper divisors (306031590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221041242 is a wasteful number, since it uses less digits than its factorization.

221041242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 221041242 is about 14867.4558011786. The cubic root of 221041242 is about 604.6319661317.

Adding to 221041242 its reverse (242140122), we get a palindrome (463181364).

The spelling of 221041242 in words is "two hundred twenty-one million, forty-one thousand, two hundred forty-two".