42420331823 has 2 divisors, whose sum is σ = 42420331824. Its totient is φ = 42420331822.

The previous prime is 42420331753. The next prime is 42420331853. The reversal of 42420331823 is 32813302424.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42420331823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42420331823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42420331853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21210165911 + 21210165912.

It is an arithmetic number, because the mean of its divisors is an integer number (21210165912).

Almost surely, 2^42420331823 is an apocalyptic number.

42420331823 is a deficient number, since it is larger than the sum of its proper divisors (1).

42420331823 is an equidigital number, since it uses as much as digits as its factorization.

42420331823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 32.

The spelling of 42420331823 in words is "forty-two billion, four hundred twenty million, three hundred thirty-one thousand, eight hundred twenty-three".