242143121 has 16 divisors (see below), whose sum is σ = 283082688. Its totient is φ = 204672000.

The previous prime is 242143091. The next prime is 242143123. The reversal of 242143121 is 121341242.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242143121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242143093 and 242143102.

It is not an unprimeable number, because it can be changed into a prime (242143123) 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, 7721 + ... + 23321.

It is an arithmetic number, because the mean of its divisors is an integer number (17692668).

Almost surely, 2^242143121 is an apocalyptic number.

It is an amenable number.

242143121 is a deficient number, since it is larger than the sum of its proper divisors (40939567).

242143121 is a wasteful number, since it uses less digits than its factorization.

242143121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15712.

The product of its digits is 384, while the sum is 20.

The square root of 242143121 is about 15560.9485893373. The cubic root of 242143121 is about 623.2907932941.

Adding to 242143121 its reverse (121341242), we get a palindrome (363484363).

The spelling of 242143121 in words is "two hundred forty-two million, one hundred forty-three thousand, one hundred twenty-one".