42002331121 has 4 divisors (see below), whose sum is σ = 42003634932. Its totient is φ = 42001027312.

The previous prime is 42002331101. The next prime is 42002331149. The reversal of 42002331121 is 12113320024.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28035818721 + 13966512400 = 167439^2 + 118180^2 .

It is a cyclic number.

It is not a de Polignac number, because 42002331121 - 2¹⁵ = 42002298353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42002331101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 602326 + ... + 668431.

It is an arithmetic number, because the mean of its divisors is an integer number (10500908733).

Almost surely, 2^42002331121 is an apocalyptic number.

It is an amenable number.

42002331121 is a deficient number, since it is larger than the sum of its proper divisors (1303811).

42002331121 is a wasteful number, since it uses less digits than its factorization.

42002331121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303810.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 42002331121 its reverse (12113320024), we get a palindrome (54115651145).

The spelling of 42002331121 in words is "forty-two billion, two million, three hundred thirty-one thousand, one hundred twenty-one".