243121235320 has 32 divisors (see below), whose sum is σ = 548748432000. Its totient is φ = 96941711488.

The previous prime is 243121235311. The next prime is 243121235353. The reversal of 243121235320 is 23532121342.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9574120 + ... + 9599479.

It is an arithmetic number, because the mean of its divisors is an integer number (17148388500).

Almost surely, 2^243121235320 is an apocalyptic number.

243121235320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243121235320 is an abundant number, since it is smaller than the sum of its proper divisors (305627196680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243121235320 is a wasteful number, since it uses less digits than its factorization.

243121235320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19173927 (or 19173923 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 243121235320 its reverse (23532121342), we get a palindrome (266653356662).

The spelling of 243121235320 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred thirty-five thousand, three hundred twenty".