243121403550 has 48 divisors (see below), whose sum is σ = 608576084352. Its totient is φ = 64226460000.

The previous prime is 243121403543. The next prime is 243121403563. The reversal of 243121403550 is 55304121342.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 7557826 + ... + 7589925.

It is an arithmetic number, because the mean of its divisors is an integer number (12678668424).

Almost surely, 2^243121403550 is an apocalyptic number.

243121403550 is an abundant number, since it is smaller than the sum of its proper divisors (365454680802).

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

243121403550 is a wasteful number, since it uses less digits than its factorization.

243121403550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15147873 (or 15147868 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 243121403550 its reverse (55304121342), we get a palindrome (298425524892).

The spelling of 243121403550 in words is "two hundred forty-three billion, one hundred twenty-one million, four hundred three thousand, five hundred fifty".