31112200103213 has 4 divisors (see below), whose sum is σ = 31112831833788. Its totient is φ = 31111568372640.

The previous prime is 31112200103207. The next prime is 31112200103233. The reversal of 31112200103213 is 31230100221113.

It is a happy number.

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 17883070830244 + 13229129272969 = 4228838^2 + 3637187^2 .

It is a cyclic number.

It is not a de Polignac number, because 31112200103213 - 2⁴⁴ = 13520014058797 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 (31112200103233) 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, 315791408 + ... + 315889913.

It is an arithmetic number, because the mean of its divisors is an integer number (7778207958447).

Almost surely, 2^{31112200103213} is an apocalyptic number.

It is an amenable number.

31112200103213 is a deficient number, since it is larger than the sum of its proper divisors (631730575).

31112200103213 is an equidigital number, since it uses as much as digits as its factorization.

31112200103213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631730574.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31112200103213 its reverse (31230100221113), we get a palindrome (62342300324326).

The spelling of 31112200103213 in words is "thirty-one trillion, one hundred twelve billion, two hundred million, one hundred three thousand, two hundred thirteen".