1242340121 has 4 divisors (see below), whose sum is σ = 1355280144. Its totient is φ = 1129400100.

The previous prime is 1242340111. The next prime is 1242340123. The reversal of 1242340121 is 1210432421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1242340121 - 2¹⁰ = 1242339097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242340093 and 1242340102.

It is not an unprimeable number, because it can be changed into a prime (1242340123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56469995 + ... + 56470016.

It is an arithmetic number, because the mean of its divisors is an integer number (338820036).

Almost surely, 2^1242340121 is an apocalyptic number.

1242340121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1242340121 is a deficient number, since it is larger than the sum of its proper divisors (112940023).

1242340121 is a wasteful number, since it uses less digits than its factorization.

1242340121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112940022.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1242340121 is about 35246.8455468004. The cubic root of 1242340121 is about 1075.0124739133.

Adding to 1242340121 its reverse (1210432421), we get a palindrome (2452772542).

The spelling of 1242340121 in words is "one billion, two hundred forty-two million, three hundred forty thousand, one hundred twenty-one".