243021545555 has 12 divisors (see below), whose sum is σ = 302028684672. Its totient is φ = 187713190560.

The previous prime is 243021545551. The next prime is 243021545587. The reversal of 243021545555 is 555545120342.

It is not a de Polignac number, because 243021545555 - 2² = 243021545551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243021545551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28892531 + ... + 28900940.

It is an arithmetic number, because the mean of its divisors is an integer number (25169057056).

Almost surely, 2^243021545555 is an apocalyptic number.

243021545555 is a deficient number, since it is larger than the sum of its proper divisors (59007139117).

243021545555 is an equidigital number, since it uses as much as digits as its factorization.

243021545555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57793534 (or 57793505 counting only the distinct ones).

The product of its (nonzero) digits is 600000, while the sum is 41.

Adding to 243021545555 its reverse (555545120342), we get a palindrome (798566665897).

The spelling of 243021545555 in words is "two hundred forty-three billion, twenty-one million, five hundred forty-five thousand, five hundred fifty-five".