42430331021 has 8 divisors (see below), whose sum is σ = 46165278264. Its totient is φ = 38762680320.

The previous prime is 42430330979. The next prime is 42430331039. The reversal of 42430331021 is 12013303424.

It can be written as a sum of positive squares in 4 ways, for example, as 3969630025 + 38460700996 = 63005^2 + 196114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-42430331021 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 (42430331051) 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 7 ways as a sum of consecutive naturals, for example, 16822820 + ... + 16825341.

It is an arithmetic number, because the mean of its divisors is an integer number (5770659783).

Almost surely, 2^42430331021 is an apocalyptic number.

It is an amenable number.

42430331021 is a deficient number, since it is larger than the sum of its proper divisors (3734947243).

42430331021 is a wasteful number, since it uses less digits than its factorization.

42430331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33648271.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 42430331021 its reverse (12013303424), we get a palindrome (54443634445).

The spelling of 42430331021 in words is "forty-two billion, four hundred thirty million, three hundred thirty-one thousand, twenty-one".