243121205430 has 256 divisors, whose sum is σ = 697068011520. Its totient is φ = 60180019200.

The previous prime is 243121205429. The next prime is 243121205471. The reversal of 243121205430 is 34502121342.

243121205430 is a `hidden beast` number, since 2 + 4 + 3 + 1 + 21 + 205 + 430 = 666.

243121205430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×243121205430² (a number of 24 digits) contains 22 as substring.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 243121205394 and 243121205403.

It is a congruent number.

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 127 ways as a sum of consecutive naturals, for example, 21982462 + ... + 21993518.

It is an arithmetic number, because the mean of its divisors is an integer number (2722921920).

Almost surely, 2^243121205430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243121205430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (348534005760).

243121205430 is an abundant number, since it is smaller than the sum of its proper divisors (453946806090).

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

243121205430 is a wasteful number, since it uses less digits than its factorization.

243121205430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11212 (or 11206 counting only the distinct ones).

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

Adding to 243121205430 its reverse (34502121342), we get a palindrome (277623326772).

The spelling of 243121205430 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred five thousand, four hundred thirty".