42543324121 has 4 divisors (see below), whose sum is σ = 42681902032. Its totient is φ = 42404746212.

The previous prime is 42543324119. The next prime is 42543324139. The reversal of 42543324121 is 12142334524.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42543324121 - 2¹ = 42543324119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42543324101) 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 3 ways as a sum of consecutive naturals, for example, 69288495 + ... + 69289108.

It is an arithmetic number, because the mean of its divisors is an integer number (10670475508).

Almost surely, 2^42543324121 is an apocalyptic number.

It is an amenable number.

42543324121 is a deficient number, since it is larger than the sum of its proper divisors (138577911).

42543324121 is a wasteful number, since it uses less digits than its factorization.

42543324121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138577910.

The product of its digits is 23040, while the sum is 31.

Adding to 42543324121 its reverse (12142334524), we get a palindrome (54685658645).

The spelling of 42543324121 in words is "forty-two billion, five hundred forty-three million, three hundred twenty-four thousand, one hundred twenty-one".