1242140322121 has 4 divisors (see below), whose sum is σ = 1250476834500. Its totient is φ = 1233803809744.

The previous prime is 1242140322091. The next prime is 1242140322127. The reversal of 1242140322121 is 1212230412421.

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 114200740096 + 1127939582025 = 337936^2 + 1062045^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242140322121 - 2⁵ = 1242140322089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242140322127) 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 3 ways as a sum of consecutive naturals, for example, 4168255966 + ... + 4168256263.

It is an arithmetic number, because the mean of its divisors is an integer number (312619208625).

Almost surely, 2^{1242140322121} is an apocalyptic number.

It is an amenable number.

1242140322121 is a deficient number, since it is larger than the sum of its proper divisors (8336512379).

1242140322121 is an equidigital number, since it uses as much as digits as its factorization.

1242140322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8336512378.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 1242140322121 its reverse (1212230412421), we get a palindrome (2454370734542).

The spelling of 1242140322121 in words is "one trillion, two hundred forty-two billion, one hundred forty million, three hundred twenty-two thousand, one hundred twenty-one".