31320312213 has 4 divisors (see below), whose sum is σ = 41760416288. Its totient is φ = 20880208140.

The previous prime is 31320312161. The next prime is 31320312263. The reversal of 31320312213 is 31221302313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31221302313 = 3 ⋅10407100771.

It is not a de Polignac number, because 31320312213 - 2²² = 31316117909 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 31320312213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320312263) 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 3 ways as a sum of consecutive naturals, for example, 5220052033 + ... + 5220052038.

It is an arithmetic number, because the mean of its divisors is an integer number (10440104072).

Almost surely, 2^31320312213 is an apocalyptic number.

It is an amenable number.

31320312213 is a deficient number, since it is larger than the sum of its proper divisors (10440104075).

31320312213 is a wasteful number, since it uses less digits than its factorization.

31320312213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10440104074.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31320312213 its reverse (31221302313), we get a palindrome (62541614526).

The spelling of 31320312213 in words is "thirty-one billion, three hundred twenty million, three hundred twelve thousand, two hundred thirteen".