242242121 has 6 divisors (see below), whose sum is σ = 266266266. Its totient is φ = 220220000.

The previous prime is 242242073. The next prime is 242242123. The reversal of 242242121 is 121242242.

It can be written as a sum of positive squares in only one way, i.e., 121242121 + 121000000 = 11011^2 + 11000^2 .

It is a de Polignac number, because none of the positive numbers 2^k-242242121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242242093 and 242242102.

It is not an unprimeable number, because it can be changed into a prime (242242123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1000880 + ... + 1001121.

It is an arithmetic number, because the mean of its divisors is an integer number (44377711).

Almost surely, 2^242242121 is an apocalyptic number.

It is an amenable number.

242242121 is a deficient number, since it is larger than the sum of its proper divisors (24024145).

242242121 is a wasteful number, since it uses less digits than its factorization.

242242121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002023 (or 2002012 counting only the distinct ones).

The product of its digits is 512, while the sum is 20.

The square root of 242242121 is about 15564.1293042688. The cubic root of 242242121 is about 623.3757256828.

Adding to 242242121 its reverse (121242242), we get a palindrome (363484363).

The spelling of 242242121 in words is "two hundred forty-two million, two hundred forty-two thousand, one hundred twenty-one".