243121245400 has 96 divisors (see below), whose sum is σ = 619410355200. Its totient is φ = 88011100800.

The previous prime is 243121245397. The next prime is 243121245421. The reversal of 243121245400 is 4542121342.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 242821 + ... + 738379.

It is an arithmetic number, because the mean of its divisors is an integer number (6452191200).

Almost surely, 2^243121245400 is an apocalyptic number.

243121245400 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 243121245400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309705177600).

243121245400 is an abundant number, since it is smaller than the sum of its proper divisors (376289109800).

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

243121245400 is a wasteful number, since it uses less digits than its factorization.

243121245400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495809 (or 495800 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 243121245400 its reverse (4542121342), we get a palindrome (247663366742).

The spelling of 243121245400 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, four hundred".