42343031021 has 6 divisors (see below), whose sum is σ = 42784066890. Its totient is φ = 41906495616.

The previous prime is 42343030967. The next prime is 42343031047. The reversal of 42343031021 is 12013034324.

It can be written as a sum of positive squares in 3 ways, for example, as 5095960996 + 37247070025 = 71386^2 + 192995^2 .

It is not a de Polignac number, because 42343031021 - 2⁶ = 42343030957 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 (42343034021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2240726 + ... + 2259543.

It is an arithmetic number, because the mean of its divisors is an integer number (7130677815).

Almost surely, 2^42343031021 is an apocalyptic number.

It is an amenable number.

42343031021 is a deficient number, since it is larger than the sum of its proper divisors (441035869).

42343031021 is an frugal number, since it uses more digits than its factorization.

42343031021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500463 (or 4500366 counting only the distinct ones).

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

Adding to 42343031021 its reverse (12013034324), we get a palindrome (54356065345).

It can be divided in two parts, 4234303 and 1021, that added together give a palindrome (4235324).

The spelling of 42343031021 in words is "forty-two billion, three hundred forty-three million, thirty-one thousand, twenty-one".