242420221 has 16 divisors (see below), whose sum is σ = 271546560. Its totient is φ = 215066880.

The previous prime is 242420209. The next prime is 242420231. The reversal of 242420221 is 122024242.

It is a cyclic number.

It is not a de Polignac number, because 242420221 - 2¹¹ = 242418173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242420231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66375 + ... + 69931.

It is an arithmetic number, because the mean of its divisors is an integer number (16971660).

Almost surely, 2^242420221 is an apocalyptic number.

It is an amenable number.

242420221 is a deficient number, since it is larger than the sum of its proper divisors (29126339).

242420221 is a wasteful number, since it uses less digits than its factorization.

242420221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3804.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 242420221 is about 15569.8497423707. The cubic root of 242420221 is about 623.5284599510.

Adding to 242420221 its reverse (122024242), we get a palindrome (364444463).

The spelling of 242420221 in words is "two hundred forty-two million, four hundred twenty thousand, two hundred twenty-one".