1242004321 has 4 divisors (see below), whose sum is σ = 1242207252. Its totient is φ = 1241801392.

The previous prime is 1242004307. The next prime is 1242004327. The reversal of 1242004321 is 1234002421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1234002421 = 163 ⋅7570567.

It can be written as a sum of positive squares in 2 ways, for example, as 278522721 + 963481600 = 16689^2 + 31040^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242004321 - 2⁷ = 1242004193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242004327) 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, 91990 + ... + 104623.

It is an arithmetic number, because the mean of its divisors is an integer number (310551813).

Almost surely, 2^1242004321 is an apocalyptic number.

It is an amenable number.

1242004321 is a deficient number, since it is larger than the sum of its proper divisors (202931).

1242004321 is an equidigital number, since it uses as much as digits as its factorization.

1242004321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202930.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1242004321 is about 35242.0816780167. The cubic root of 1242004321 is about 1074.9156078693.

Adding to 1242004321 its reverse (1234002421), we get a palindrome (2476006742).

The spelling of 1242004321 in words is "one billion, two hundred forty-two million, four thousand, three hundred twenty-one".