243342121 has 4 divisors (see below), whose sum is σ = 265464144. Its totient is φ = 221220100.

The previous prime is 243342091. The next prime is 243342149. The reversal of 243342121 is 121243342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243342121 - 2¹³ = 243333929 is a prime.

It is a super-3 number, since 3×243342121³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243342092 and 243342101.

It is not an unprimeable number, because it can be changed into a prime (243342521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11060995 + ... + 11061016.

It is an arithmetic number, because the mean of its divisors is an integer number (66366036).

Almost surely, 2^243342121 is an apocalyptic number.

It is an amenable number.

243342121 is a deficient number, since it is larger than the sum of its proper divisors (22122023).

243342121 is a wasteful number, since it uses less digits than its factorization.

243342121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22122022.

The product of its digits is 1152, while the sum is 22.

The square root of 243342121 is about 15599.4269446028. The cubic root of 243342121 is about 624.3178656993.

Adding to 243342121 its reverse (121243342), we get a palindrome (364585463).

The spelling of 243342121 in words is "two hundred forty-three million, three hundred forty-two thousand, one hundred twenty-one".