243121243400 has 96 divisors (see below), whose sum is σ = 646223520000. Its totient is φ = 83328030720.

The previous prime is 243121243397. The next prime is 243121243447. The reversal of 243121243400 is 4342121342.

It is a self number, because there is not a number n which added to its sum of digits gives 243121243400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4409201 + ... + 4463999.

It is an arithmetic number, because the mean of its divisors is an integer number (6731495000).

Almost surely, 2^243121243400 is an apocalyptic number.

243121243400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243121243400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323111760000).

243121243400 is an abundant number, since it is smaller than the sum of its proper divisors (403102276600).

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

243121243400 is a wasteful number, since it uses less digits than its factorization.

243121243400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57991 (or 57982 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 243121243400 its reverse (4342121342), we get a palindrome (247463364742).

The spelling of 243121243400 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-three thousand, four hundred".