42340443021 has 24 divisors (see below), whose sum is σ = 63826528896. Its totient is φ = 26995874400.

The previous prime is 42340443017. The next prime is 42340443023. The reversal of 42340443021 is 12034404324.

It is a happy number.

It is not a de Polignac number, because 42340443021 - 2² = 42340443017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42340443023) 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 23 ways as a sum of consecutive naturals, for example, 2496456 + ... + 2513358.

It is an arithmetic number, because the mean of its divisors is an integer number (2659438704).

Almost surely, 2^42340443021 is an apocalyptic number.

It is an amenable number.

42340443021 is a deficient number, since it is larger than the sum of its proper divisors (21486085875).

42340443021 is a wasteful number, since it uses less digits than its factorization.

42340443021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29033 (or 29030 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 42340443021 its reverse (12034404324), we get a palindrome (54374847345).

The spelling of 42340443021 in words is "forty-two billion, three hundred forty million, four hundred forty-three thousand, twenty-one".