4242321437561 has 24 divisors (see below), whose sum is σ = 4462307238144. Its totient is φ = 4028952474720.

The previous prime is 4242321437539. The next prime is 4242321437579. The reversal of 4242321437561 is 1657341232424.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-4242321437561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4242321437261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63310271 + ... + 63377243.

It is an arithmetic number, because the mean of its divisors is an integer number (185929468256).

Almost surely, 2^{4242321437561} is an apocalyptic number.

It is an amenable number.

4242321437561 is a deficient number, since it is larger than the sum of its proper divisors (219985800583).

4242321437561 is an equidigital number, since it uses as much as digits as its factorization.

4242321437561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67709 (or 67650 counting only the distinct ones).

The product of its digits is 967680, while the sum is 44.

Adding to 4242321437561 its reverse (1657341232424), we get a palindrome (5899662669985).

The spelling of 4242321437561 in words is "four trillion, two hundred forty-two billion, three hundred twenty-one million, four hundred thirty-seven thousand, five hundred sixty-one".