31103313101213 has 4 divisors (see below), whose sum is σ = 31124719374588. Its totient is φ = 31081906827840.

The previous prime is 31103313101177. The next prime is 31103313101227. The reversal of 31103313101213 is 31210131330113.

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 16210181758969 + 14893131342244 = 4026187^2 + 3859162^2 .

It is a cyclic number.

It is not a de Polignac number, because 31103313101213 - 2⁶ = 31103313101149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103313106213) 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, 10703134508 + ... + 10703137413.

It is an arithmetic number, because the mean of its divisors is an integer number (7781179843647).

Almost surely, 2^{31103313101213} is an apocalyptic number.

It is an amenable number.

31103313101213 is a deficient number, since it is larger than the sum of its proper divisors (21406273375).

31103313101213 is a wasteful number, since it uses less digits than its factorization.

31103313101213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21406273374.

The product of its (nonzero) digits is 486, while the sum is 23.

Adding to 31103313101213 its reverse (31210131330113), we get a palindrome (62313444431326).

The spelling of 31103313101213 in words is "thirty-one trillion, one hundred three billion, three hundred thirteen million, one hundred one thousand, two hundred thirteen".