243121242544 has 20 divisors (see below), whose sum is σ = 471135113280. Its totient is φ = 121537987520.

The previous prime is 243121242527. The next prime is 243121242643. The reversal of 243121242544 is 445242121342.

It is a super-2 number, since 2×243121242544² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1325824 + ... + 1498015.

It is an arithmetic number, because the mean of its divisors is an integer number (23556755664).

Almost surely, 2^243121242544 is an apocalyptic number.

It is an amenable number.

243121242544 is a deficient number, since it is larger than the sum of its proper divisors (228013870736).

243121242544 is a wasteful number, since it uses less digits than its factorization.

243121242544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829228 (or 2829222 counting only the distinct ones).

The product of its digits is 61440, while the sum is 34.

Adding to 243121242544 its reverse (445242121342), we get a palindrome (688363363886).

The spelling of 243121242544 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-two thousand, five hundred forty-four".