1242321 has 4 divisors (see below), whose sum is σ = 1656432. Its totient is φ = 828212.

The previous prime is 1242317. The next prime is 1242347. The reversal of 1242321 is 1232421.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1232421 = 3 ⋅410807.

It is a cyclic number.

It is not a de Polignac number, because 1242321 - 2² = 1242317 is a prime.

It is a super-2 number, since 2×1242321² = 3086722934082, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1242321.

It is not an unprimeable number, because it can be changed into a prime (1242361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207051 + ... + 207056.

It is an arithmetic number, because the mean of its divisors is an integer number (414108).

2^1242321 is an apocalyptic number.

It is an amenable number.

1242321 is a deficient number, since it is larger than the sum of its proper divisors (414111).

1242321 is an equidigital number, since it uses as much as digits as its factorization.

1242321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414110.

The product of its digits is 96, while the sum is 15.

The square root of 1242321 is about 1114.5945451149. The cubic root of 1242321 is about 107.5006958671.

Adding to 1242321 its reverse (1232421), we get a palindrome (2474742).

The spelling of 1242321 in words is "one million, two hundred forty-two thousand, three hundred twenty-one".