242122121 has 16 divisors (see below), whose sum is σ = 259657728. Its totient is φ = 225363600.

The previous prime is 242122079. The next prime is 242122129. The reversal of 242122121 is 121221242.

It is a cyclic number.

It is not a de Polignac number, because 242122121 - 2¹⁰ = 242121097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 242122121.

It is not an unprimeable number, because it can be changed into a prime (242122129) 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, 87956 + ... + 90666.

It is an arithmetic number, because the mean of its divisors is an integer number (16228608).

Almost surely, 2^242122121 is an apocalyptic number.

It is an amenable number.

242122121 is a deficient number, since it is larger than the sum of its proper divisors (17535607).

242122121 is a wasteful number, since it uses less digits than its factorization.

242122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2852.

The product of its digits is 128, while the sum is 17.

The square root of 242122121 is about 15560.2738086449. The cubic root of 242122121 is about 623.2727743570.

Adding to 242122121 its reverse (121221242), we get a palindrome (363343363).

It can be divided in two parts, 2421221 and 21, that added together give a palindrome (2421242).

The spelling of 242122121 in words is "two hundred forty-two million, one hundred twenty-two thousand, one hundred twenty-one".