42421717643 has 2 divisors, whose sum is σ = 42421717644. Its totient is φ = 42421717642.

The previous prime is 42421717609. The next prime is 42421717673. The reversal of 42421717643 is 34671712424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42421717643 - 2²² = 42417523339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42421717643.

It is not a weakly prime, because it can be changed into another prime (42421717673) 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 as a sum of consecutive naturals, namely, 21210858821 + 21210858822.

It is an arithmetic number, because the mean of its divisors is an integer number (21210858822).

Almost surely, 2^42421717643 is an apocalyptic number.

42421717643 is a deficient number, since it is larger than the sum of its proper divisors (1).

42421717643 is an equidigital number, since it uses as much as digits as its factorization.

42421717643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 41.

The spelling of 42421717643 in words is "forty-two billion, four hundred twenty-one million, seven hundred seventeen thousand, six hundred forty-three".