4042321091 has 2 divisors, whose sum is σ = 4042321092. Its totient is φ = 4042321090.

The previous prime is 4042321033. The next prime is 4042321121. The reversal of 4042321091 is 1901232404.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4042321091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4042321091.

It is not a weakly prime, because it can be changed into another prime (4042321391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2021160545 + 2021160546.

It is an arithmetic number, because the mean of its divisors is an integer number (2021160546).

Almost surely, 2^4042321091 is an apocalyptic number.

4042321091 is a deficient number, since it is larger than the sum of its proper divisors (1).

4042321091 is an equidigital number, since it uses as much as digits as its factorization.

4042321091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 4042321091 is about 63579.2504752926. The cubic root of 4042321091 is about 1592.9798017838.

Adding to 4042321091 its reverse (1901232404), we get a palindrome (5943553495).

The spelling of 4042321091 in words is "four billion, forty-two million, three hundred twenty-one thousand, ninety-one".