242121 has 24 divisors (see below), whose sum is σ = 383040. Its totient is φ = 135520.

The previous prime is 242119. The next prime is 242129. The reversal of 242121 is 121242.

It is not a de Polignac number, because 242121 - 2¹ = 242119 is a prime.

It is a Curzon number.

242121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 242097 and 242106.

It is not an unprimeable number, because it can be changed into a prime (242129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8335 + ... + 8363.

It is an arithmetic number, because the mean of its divisors is an integer number (15960).

2²⁴²¹²¹ is an apocalyptic number.

It is an amenable number.

242121 is a deficient number, since it is larger than the sum of its proper divisors (140919).

242121 is a wasteful number, since it uses less digits than its factorization.

242121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 66 counting only the distinct ones).

The product of its digits is 32, while the sum is 12.

The square root of 242121 is about 492.0579234196. The cubic root of 242121 is about 62.3271812460.

Adding to 242121 its reverse (121242), we get a palindrome (363363).

It can be divided in two parts, 2421 and 21, that added together give a palindrome (2442).

The spelling of 242121 in words is "two hundred forty-two thousand, one hundred twenty-one", and thus it is an iban number.