243121243500 has 192 divisors, whose sum is σ = 792831836160. Its totient is φ = 64321387200.

The previous prime is 243121243459. The next prime is 243121243513. The reversal of 243121243500 is 5342121342.

243121243500 is a `hidden beast` number, since 2 + 4 + 31 + 2 + 124 + 3 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1643599 + ... + 1785401.

It is an arithmetic number, because the mean of its divisors is an integer number (4129332480).

Almost surely, 2^243121243500 is an apocalyptic number.

243121243500 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 243121243500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (396415918080).

243121243500 is an abundant number, since it is smaller than the sum of its proper divisors (549710592660).

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

243121243500 is a wasteful number, since it uses less digits than its factorization.

243121243500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141958 (or 141940 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 243121243500 its reverse (5342121342), we get a palindrome (248463364842).

The spelling of 243121243500 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-three thousand, five hundred".