31320104213 has 4 divisors (see below), whose sum is σ = 31327693740. Its totient is φ = 31312514688.

The previous prime is 31320104209. The next prime is 31320104219. The reversal of 31320104213 is 31240102313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31240102313 = 7 ⋅4462871759.

It can be written as a sum of positive squares in 2 ways, for example, as 16185691729 + 15134412484 = 127223^2 + 123022^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320104213 - 2² = 31320104209 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 (31320104219) 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, 3788570 + ... + 3796827.

It is an arithmetic number, because the mean of its divisors is an integer number (7831923435).

Almost surely, 2^31320104213 is an apocalyptic number.

It is an amenable number.

31320104213 is a deficient number, since it is larger than the sum of its proper divisors (7589527).

31320104213 is an equidigital number, since it uses as much as digits as its factorization.

31320104213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7589526.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31320104213 its reverse (31240102313), we get a palindrome (62560206526).

The spelling of 31320104213 in words is "thirty-one billion, three hundred twenty million, one hundred four thousand, two hundred thirteen".