242101221 has 4 divisors (see below), whose sum is σ = 322801632. Its totient is φ = 161400812.

The previous prime is 242101219. The next prime is 242101241. The reversal of 242101221 is 122101242.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 242101221 - 2¹ = 242101219 is a prime.

It is a super-2 number, since 2×242101221² = 117226002419381682, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 242101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242101241) 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 3 ways as a sum of consecutive naturals, for example, 40350201 + ... + 40350206.

It is an arithmetic number, because the mean of its divisors is an integer number (80700408).

Almost surely, 2^242101221 is an apocalyptic number.

It is an amenable number.

242101221 is a deficient number, since it is larger than the sum of its proper divisors (80700411).

242101221 is an equidigital number, since it uses as much as digits as its factorization.

242101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80700410.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 242101221 is about 15559.6022121390. The cubic root of 242101221 is about 623.2548401897.

Adding to 242101221 its reverse (122101242), we get a palindrome (364202463).

The spelling of 242101221 in words is "two hundred forty-two million, one hundred one thousand, two hundred twenty-one".