31212213313 has 4 divisors (see below), whose sum is σ = 31250700208. Its totient is φ = 31173726420.

The previous prime is 31212213289. The next prime is 31212213323. The reversal of 31212213313 is 31331221213.

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: 31331221213 = 421 ⋅74420953.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31212213313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212213323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19242231 + ... + 19243852.

It is an arithmetic number, because the mean of its divisors is an integer number (7812675052).

Almost surely, 2^31212213313 is an apocalyptic number.

It is an amenable number.

31212213313 is a deficient number, since it is larger than the sum of its proper divisors (38486895).

31212213313 is an equidigital number, since it uses as much as digits as its factorization.

31212213313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38486894.

The product of its digits is 648, while the sum is 22.

Adding to 31212213313 its reverse (31331221213), we get a palindrome (62543434526).

The spelling of 31212213313 in words is "thirty-one billion, two hundred twelve million, two hundred thirteen thousand, three hundred thirteen".