31212100212313 has 4 divisors (see below), whose sum is σ = 31215334971700. Its totient is φ = 31208865452928.

The previous prime is 31212100212299. The next prime is 31212100212329. The reversal of 31212100212313 is 31321200121213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3238283027529 + 27973817184784 = 1799523^2 + 5289028^2 .

It is a cyclic number.

It is not a de Polignac number, because 31212100212313 - 2¹³ = 31212100204121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212100213313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1617365220 + ... + 1617384517.

It is an arithmetic number, because the mean of its divisors is an integer number (7803833742925).

Almost surely, 2^{31212100212313} is an apocalyptic number.

It is an amenable number.

31212100212313 is a deficient number, since it is larger than the sum of its proper divisors (3234759387).

31212100212313 is an equidigital number, since it uses as much as digits as its factorization.

31212100212313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3234759386.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31212100212313 its reverse (31321200121213), we get a palindrome (62533300333526).

The spelling of 31212100212313 in words is "thirty-one trillion, two hundred twelve billion, one hundred million, two hundred twelve thousand, three hundred thirteen".