243232121 has 16 divisors (see below), whose sum is σ = 268316160. Its totient is φ = 218661120.

The previous prime is 243232103. The next prime is 243232127. The reversal of 243232121 is 121232342.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243232121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 243232093 and 243232102.

It is not an unprimeable number, because it can be changed into a prime (243232127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 561521 + ... + 561953.

It is an arithmetic number, because the mean of its divisors is an integer number (16769760).

Almost surely, 2^243232121 is an apocalyptic number.

It is an amenable number.

243232121 is a deficient number, since it is larger than the sum of its proper divisors (25084039).

243232121 is a wasteful number, since it uses less digits than its factorization.

243232121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896.

The product of its digits is 576, while the sum is 20.

The square root of 243232121 is about 15595.9007755243. The cubic root of 243232121 is about 624.2237796235.

Adding to 243232121 its reverse (121232342), we get a palindrome (364464463).

It can be divided in two parts, 2432321 and 21, that added together give a palindrome (2432342).

The spelling of 243232121 in words is "two hundred forty-three million, two hundred thirty-two thousand, one hundred twenty-one".