42344342021 has 4 divisors (see below), whose sum is σ = 42578288844. Its totient is φ = 42110395200.

The previous prime is 42344342003. The next prime is 42344342023. The reversal of 42344342021 is 12024344324.

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 6004545121 + 36339796900 = 77489^2 + 190630^2 .

It is a cyclic number.

It is not a de Polignac number, because 42344342021 - 2²⁶ = 42277233157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42344342023) 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, 116973140 + ... + 116973501.

It is an arithmetic number, because the mean of its divisors is an integer number (10644572211).

Almost surely, 2^42344342021 is an apocalyptic number.

It is an amenable number.

42344342021 is a deficient number, since it is larger than the sum of its proper divisors (233946823).

42344342021 is a wasteful number, since it uses less digits than its factorization.

42344342021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233946822.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 42344342021 its reverse (12024344324), we get a palindrome (54368686345).

The spelling of 42344342021 in words is "forty-two billion, three hundred forty-four million, three hundred forty-two thousand, twenty-one".