42512421643 has 4 divisors (see below), whose sum is σ = 42525311400. Its totient is φ = 42499531888.

The previous prime is 42512421607. The next prime is 42512421647. The reversal of 42512421643 is 34612421524.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42512421643 - 2¹⁷ = 42512290571 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42512421599 and 42512421608.

It is not an unprimeable number, because it can be changed into a prime (42512421647) 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 in 3 ways as a sum of consecutive naturals, for example, 6439930 + ... + 6446527.

It is an arithmetic number, because the mean of its divisors is an integer number (10631327850).

Almost surely, 2^42512421643 is an apocalyptic number.

42512421643 is a deficient number, since it is larger than the sum of its proper divisors (12889757).

42512421643 is a wasteful number, since it uses less digits than its factorization.

42512421643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12889756.

The product of its digits is 46080, while the sum is 34.

The spelling of 42512421643 in words is "forty-two billion, five hundred twelve million, four hundred twenty-one thousand, six hundred forty-three".