242120511555 has 32 divisors (see below), whose sum is σ = 417222731520. Its totient is φ = 119189086080.

The previous prime is 242120511469. The next prime is 242120511557. The reversal of 242120511555 is 555115021242.

It is not a de Polignac number, because 242120511555 - 2⁸ = 242120511299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (242120511557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3241216 + ... + 3315074.

It is an arithmetic number, because the mean of its divisors is an integer number (13038210360).

Almost surely, 2^242120511555 is an apocalyptic number.

242120511555 is a deficient number, since it is larger than the sum of its proper divisors (175102219965).

242120511555 is a wasteful number, since it uses less digits than its factorization.

242120511555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90691.

The product of its (nonzero) digits is 20000, while the sum is 33.

Adding to 242120511555 its reverse (555115021242), we get a palindrome (797235532797).

The spelling of 242120511555 in words is "two hundred forty-two billion, one hundred twenty million, five hundred eleven thousand, five hundred fifty-five".