243121243020 has 48 divisors (see below), whose sum is σ = 687479492448. Its totient is φ = 64190425600.

The previous prime is 243121243019. The next prime is 243121243039. The reversal of 243121243020 is 20342121342.

It is a happy number.

243121243020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20053449 + ... + 20065568.

It is an arithmetic number, because the mean of its divisors is an integer number (14322489426).

Almost surely, 2^243121243020 is an apocalyptic number.

243121243020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243121243020 is an abundant number, since it is smaller than the sum of its proper divisors (444358249428).

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

243121243020 is a wasteful number, since it uses less digits than its factorization.

243121243020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40119130 (or 40119128 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 243121243020 its reverse (20342121342), we get a palindrome (263463364362).

The spelling of 243121243020 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-three thousand, twenty".