31212122323313 has 4 divisors (see below), whose sum is σ = 33048129518820. Its totient is φ = 29376115127808.

The previous prime is 31212122323309. The next prime is 31212122323373. The reversal of 31212122323313 is 31332322121213.

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 14527250200369 + 16684872122944 = 3811463^2 + 4084712^2 .

It is not a de Polignac number, because 31212122323313 - 2² = 31212122323309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212122323303) 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, 918003597728 + ... + 918003597761.

It is an arithmetic number, because the mean of its divisors is an integer number (8262032379705).

Almost surely, 2^{31212122323313} is an apocalyptic number.

It is an amenable number.

31212122323313 is a deficient number, since it is larger than the sum of its proper divisors (1836007195507).

31212122323313 is a wasteful number, since it uses less digits than its factorization.

31212122323313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836007195506.

The product of its digits is 7776, while the sum is 29.

Adding to 31212122323313 its reverse (31332322121213), we get a palindrome (62544444444526).

The spelling of 31212122323313 in words is "thirty-one trillion, two hundred twelve billion, one hundred twenty-two million, three hundred twenty-three thousand, three hundred thirteen".