31031341021 has 4 divisors (see below), whose sum is σ = 31035532252. Its totient is φ = 31027149792.

The previous prime is 31031341007. The next prime is 31031341067. The reversal of 31031341021 is 12014313013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12014313013 = 8443 ⋅1422991.

It can be written as a sum of positive squares in 2 ways, for example, as 20082857796 + 10948483225 = 141714^2 + 104635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31031341021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31031341021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31031341421) 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 3 ways as a sum of consecutive naturals, for example, 2084490 + ... + 2099323.

It is an arithmetic number, because the mean of its divisors is an integer number (7758883063).

Almost surely, 2^31031341021 is an apocalyptic number.

It is an amenable number.

31031341021 is a deficient number, since it is larger than the sum of its proper divisors (4191231).

31031341021 is an equidigital number, since it uses as much as digits as its factorization.

31031341021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4191230.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31031341021 its reverse (12014313013), we get a palindrome (43045654034).

The spelling of 31031341021 in words is "thirty-one billion, thirty-one million, three hundred forty-one thousand, twenty-one".