243121234400 has 216 divisors, whose sum is σ = 656741059632. Its totient is φ = 87816960000.

The previous prime is 243121234351. The next prime is 243121234423. The reversal of 243121234400 is 4432121342.

It is a self number, because there is not a number n which added to its sum of digits gives 243121234400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14608484 + ... + 14625116.

Almost surely, 2^243121234400 is an apocalyptic number.

243121234400 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 243121234400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328370529816).

243121234400 is an abundant number, since it is smaller than the sum of its proper divisors (413619825232).

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

243121234400 is a wasteful number, since it uses less digits than its factorization.

243121234400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16826 (or 16802 counting only the distinct ones).

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

Adding to 243121234400 its reverse (4432121342), we get a palindrome (247553355742).

The spelling of 243121234400 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred thirty-four thousand, four hundred".