642238487121 has 32 divisors (see below), whose sum is σ = 1067698713600. Its totient is φ = 333604918080.

The previous prime is 642238487041. The next prime is 642238487123. The reversal of 642238487121 is 121784832246.

It is not a de Polignac number, because 642238487121 - 2¹¹ = 642238485073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642238487123) 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 31 ways as a sum of consecutive naturals, for example, 3141610 + ... + 3339788.

It is an arithmetic number, because the mean of its divisors is an integer number (33365584800).

Almost surely, 2^642238487121 is an apocalyptic number.

It is an amenable number.

642238487121 is a deficient number, since it is larger than the sum of its proper divisors (425460226479).

642238487121 is a wasteful number, since it uses less digits than its factorization.

642238487121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212229.

The product of its digits is 1032192, while the sum is 48.

The spelling of 642238487121 in words is "six hundred forty-two billion, two hundred thirty-eight million, four hundred eighty-seven thousand, one hundred twenty-one".