242551123221 has 32 divisors (see below), whose sum is σ = 356023444608. Its totient is φ = 145658992640.

The previous prime is 242551123201. The next prime is 242551123223. The reversal of 242551123221 is 122321155242.

242551123221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 242551123221 - 2¹⁰ = 242551122197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242551123223) 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 31 ways as a sum of consecutive naturals, for example, 18179665 + ... + 18193001.

It is an arithmetic number, because the mean of its divisors is an integer number (11125732644).

Almost surely, 2^242551123221 is an apocalyptic number.

It is an amenable number.

242551123221 is a deficient number, since it is larger than the sum of its proper divisors (113472321387).

242551123221 is a wasteful number, since it uses less digits than its factorization.

242551123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18341.

The product of its digits is 9600, while the sum is 30.

Adding to 242551123221 its reverse (122321155242), we get a palindrome (364872278463).

The spelling of 242551123221 in words is "two hundred forty-two billion, five hundred fifty-one million, one hundred twenty-three thousand, two hundred twenty-one".