242868121 has 4 divisors (see below), whose sum is σ = 243090612. Its totient is φ = 242645632.

The previous prime is 242868113. The next prime is 242868161. The reversal of 242868121 is 121868242.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131354521 + 111513600 = 11461^2 + 10560^2 .

It is a cyclic number.

It is not a de Polignac number, because 242868121 - 2³ = 242868113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242868161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109600 + ... + 111793.

It is an arithmetic number, because the mean of its divisors is an integer number (60772653).

Almost surely, 2^242868121 is an apocalyptic number.

It is an amenable number.

242868121 is a deficient number, since it is larger than the sum of its proper divisors (222491).

242868121 is a wasteful number, since it uses less digits than its factorization.

242868121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222490.

The product of its digits is 12288, while the sum is 34.

The square root of 242868121 is about 15584.2266731462. The cubic root of 242868121 is about 623.9122378559.

The spelling of 242868121 in words is "two hundred forty-two million, eight hundred sixty-eight thousand, one hundred twenty-one".