243021352553 has 4 divisors (see below), whose sum is σ = 277738688640. Its totient is φ = 208304016468.

The previous prime is 243021352529. The next prime is 243021352559. The reversal of 243021352553 is 355253120342.

243021352553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243021352553 - 2¹² = 243021348457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243021352559) 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 3 ways as a sum of consecutive naturals, for example, 17358668033 + ... + 17358668046.

It is an arithmetic number, because the mean of its divisors is an integer number (69434672160).

Almost surely, 2^243021352553 is an apocalyptic number.

It is an amenable number.

243021352553 is a deficient number, since it is larger than the sum of its proper divisors (34717336087).

243021352553 is an equidigital number, since it uses as much as digits as its factorization.

243021352553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34717336086.

The product of its (nonzero) digits is 108000, while the sum is 35.

Adding to 243021352553 its reverse (355253120342), we get a palindrome (598274472895).

The spelling of 243021352553 in words is "two hundred forty-three billion, twenty-one million, three hundred fifty-two thousand, five hundred fifty-three".