31212101313 has 24 divisors (see below), whose sum is σ = 45394951680. Its totient is φ = 20664980640.

The previous prime is 31212101311. The next prime is 31212101317. The reversal of 31212101313 is 31310121213.

It is not a de Polignac number, because 31212101313 - 2¹ = 31212101311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31212101311) 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 23 ways as a sum of consecutive naturals, for example, 1049395 + ... + 1078727.

It is an arithmetic number, because the mean of its divisors is an integer number (1891456320).

Almost surely, 2^31212101313 is an apocalyptic number.

It is an amenable number.

31212101313 is a deficient number, since it is larger than the sum of its proper divisors (14182850367).

31212101313 is a wasteful number, since it uses less digits than its factorization.

31212101313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30149 (or 30146 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31212101313 its reverse (31310121213), we get a palindrome (62522222526).

The spelling of 31212101313 in words is "thirty-one billion, two hundred twelve million, one hundred one thousand, three hundred thirteen".