243121243553 has 8 divisors (see below), whose sum is σ = 251843256000. Its totient is φ = 234421799248.

The previous prime is 243121243549. The next prime is 243121243571. The reversal of 243121243553 is 355342121342.

243121243553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243121243553 - 2² = 243121243549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243121243513) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5620103 + ... + 5663196.

It is an arithmetic number, because the mean of its divisors is an integer number (31480407000).

Almost surely, 2^243121243553 is an apocalyptic number.

It is an amenable number.

243121243553 is a deficient number, since it is larger than the sum of its proper divisors (8722012447).

243121243553 is a wasteful number, since it uses less digits than its factorization.

243121243553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11284071.

The product of its digits is 86400, while the sum is 35.

Adding to 243121243553 its reverse (355342121342), we get a palindrome (598463364895).

The spelling of 243121243553 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-three thousand, five hundred fifty-three".