42343013021 has 4 divisors (see below), whose sum is σ = 42351964092. Its totient is φ = 42334061952.

The previous prime is 42343013003. The next prime is 42343013059. The reversal of 42343013021 is 12031034324.

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 29889568996 + 12453444025 = 172886^2 + 111595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42343013021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42343013081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4468436 + ... + 4477901.

It is an arithmetic number, because the mean of its divisors is an integer number (10587991023).

Almost surely, 2^42343013021 is an apocalyptic number.

It is an amenable number.

42343013021 is a deficient number, since it is larger than the sum of its proper divisors (8951071).

42343013021 is an equidigital number, since it uses as much as digits as its factorization.

42343013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8951070.

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

Adding to 42343013021 its reverse (12031034324), we get a palindrome (54374047345).

The spelling of 42343013021 in words is "forty-two billion, three hundred forty-three million, thirteen thousand, twenty-one".