642262423421 has 32 divisors (see below), whose sum is σ = 677278457856. Its totient is φ = 608297976000.

The previous prime is 642262423403. The next prime is 642262423423. The reversal of 642262423421 is 124324262246.

It is not a de Polignac number, because 642262423421 - 2²⁶ = 642195314557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642262423423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245043491 + ... + 245046111.

It is an arithmetic number, because the mean of its divisors is an integer number (21164951808).

Almost surely, 2^642262423421 is an apocalyptic number.

It is an amenable number.

642262423421 is a deficient number, since it is larger than the sum of its proper divisors (35016034435).

642262423421 is a wasteful number, since it uses less digits than its factorization.

642262423421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3593.

The product of its digits is 221184, while the sum is 38.

Adding to 642262423421 its reverse (124324262246), we get a palindrome (766586685667).

The spelling of 642262423421 in words is "six hundred forty-two billion, two hundred sixty-two million, four hundred twenty-three thousand, four hundred twenty-one".