242135221 has 8 divisors (see below), whose sum is σ = 255286080. Its totient is φ = 229025088.

The previous prime is 242135219. The next prime is 242135227. The reversal of 242135221 is 122531242.

It is a happy number.

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

It is not a de Polignac number, because 242135221 - 2¹ = 242135219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242135192 and 242135201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242135227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2445 + ... + 22141.

It is an arithmetic number, because the mean of its divisors is an integer number (31910760).

Almost surely, 2^242135221 is an apocalyptic number.

It is an amenable number.

242135221 is a deficient number, since it is larger than the sum of its proper divisors (13150859).

242135221 is a wasteful number, since it uses less digits than its factorization.

242135221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20363.

The product of its digits is 960, while the sum is 22.

The square root of 242135221 is about 15560.6947467007. The cubic root of 242135221 is about 623.2840148638.

Adding to 242135221 its reverse (122531242), we get a palindrome (364666463).

The spelling of 242135221 in words is "two hundred forty-two million, one hundred thirty-five thousand, two hundred twenty-one".