242551330121 has 4 divisors (see below), whose sum is σ = 242552597700. Its totient is φ = 242550062544.

The previous prime is 242551330097. The next prime is 242551330129. The reversal of 242551330121 is 121033155242.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69728211721 + 172823118400 = 264061^2 + 415720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242551330121 is a prime.

It is a super-2 number, since 2×242551330121² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242551330129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281486 + ... + 751223.

It is an arithmetic number, because the mean of its divisors is an integer number (60638149425).

Almost surely, 2^242551330121 is an apocalyptic number.

It is an amenable number.

242551330121 is a deficient number, since it is larger than the sum of its proper divisors (1267579).

242551330121 is a wasteful number, since it uses less digits than its factorization.

242551330121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267578.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 242551330121 its reverse (121033155242), we get a palindrome (363584485363).

The spelling of 242551330121 in words is "two hundred forty-two billion, five hundred fifty-one million, three hundred thirty thousand, one hundred twenty-one".