42021866023 has 2 divisors, whose sum is σ = 42021866024. Its totient is φ = 42021866022.

The previous prime is 42021866009. The next prime is 42021866071. The reversal of 42021866023 is 32066812024.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42021866023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42021866023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42021866123) 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, 21010933011 + 21010933012.

It is an arithmetic number, because the mean of its divisors is an integer number (21010933012).

Almost surely, 2^42021866023 is an apocalyptic number.

42021866023 is a deficient number, since it is larger than the sum of its proper divisors (1).

42021866023 is an equidigital number, since it uses as much as digits as its factorization.

42021866023 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 34.

The spelling of 42021866023 in words is "forty-two billion, twenty-one million, eight hundred sixty-six thousand, twenty-three".