243121234405 has 48 divisors (see below), whose sum is σ = 348406059456. Its totient is φ = 162294155520.

The previous prime is 243121234351. The next prime is 243121234423. The reversal of 243121234405 is 504432121342.

It is not a de Polignac number, because 243121234405 - 2¹¹ = 243121232357 is a prime.

It is a super-2 number, since 2×243121234405² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4665102 + ... + 4716928.

It is an arithmetic number, because the mean of its divisors is an integer number (7258459572).

Almost surely, 2^243121234405 is an apocalyptic number.

It is an amenable number.

243121234405 is a deficient number, since it is larger than the sum of its proper divisors (105284825051).

243121234405 is a wasteful number, since it uses less digits than its factorization.

243121234405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52354 (or 52347 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 243121234405 its reverse (504432121342), we get a palindrome (747553355747).

The spelling of 243121234405 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred thirty-four thousand, four hundred five".