1242340321 has 4 divisors (see below), whose sum is σ = 1259838144. Its totient is φ = 1224842500.

The previous prime is 1242340273. The next prime is 1242340357. The reversal of 1242340321 is 1230432421.

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 a de Polignac number, because none of the positive numbers 2^k-1242340321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242340292 and 1242340301.

It is not an unprimeable number, because it can be changed into a prime (1242340361) 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, 8748805 + ... + 8748946.

It is an arithmetic number, because the mean of its divisors is an integer number (314959536).

Almost surely, 2^1242340321 is an apocalyptic number.

It is an amenable number.

1242340321 is a deficient number, since it is larger than the sum of its proper divisors (17497823).

1242340321 is an equidigital number, since it uses as much as digits as its factorization.

1242340321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17497822.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1242340321 is about 35246.8483839336. The cubic root of 1242340321 is about 1075.0125316008.

Adding to 1242340321 its reverse (1230432421), we get a palindrome (2472772742).

The spelling of 1242340321 in words is "one billion, two hundred forty-two million, three hundred forty thousand, three hundred twenty-one".