1242435521 has 4 divisors (see below), whose sum is σ = 1242651072. Its totient is φ = 1242219972.

The previous prime is 1242435443. The next prime is 1242435559. The reversal of 1242435521 is 1255342421.

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 1242435521 - 2¹⁴ = 1242419137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242435581) 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, 98885 + ... + 110738.

It is an arithmetic number, because the mean of its divisors is an integer number (310662768).

Almost surely, 2^1242435521 is an apocalyptic number.

It is an amenable number.

1242435521 is a deficient number, since it is larger than the sum of its proper divisors (215551).

1242435521 is an equidigital number, since it uses as much as digits as its factorization.

1242435521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215550.

The product of its digits is 9600, while the sum is 29.

The square root of 1242435521 is about 35248.1988334156. The cubic root of 1242435521 is about 1075.0399901475.

Adding to 1242435521 its reverse (1255342421), we get a palindrome (2497777942).

The spelling of 1242435521 in words is "one billion, two hundred forty-two million, four hundred thirty-five thousand, five hundred twenty-one".