31120212213 has 12 divisors (see below), whose sum is σ = 45396482508. Its totient is φ = 20541393600.

The previous prime is 31120212199. The next prime is 31120212259. The reversal of 31120212213 is 31221202113.

It can be written as a sum of positive squares in 2 ways, for example, as 18213661764 + 12906550449 = 134958^2 + 113607^2 .

It is not a de Polignac number, because 31120212213 - 2⁵ = 31120212181 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120292213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17116920 + ... + 17118737.

It is an arithmetic number, because the mean of its divisors is an integer number (3783040209).

Almost surely, 2^31120212213 is an apocalyptic number.

It is an amenable number.

31120212213 is a deficient number, since it is larger than the sum of its proper divisors (14276270295).

31120212213 is a wasteful number, since it uses less digits than its factorization.

31120212213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34235764 (or 34235761 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31120212213 its reverse (31221202113), we get a palindrome (62341414326).

The spelling of 31120212213 in words is "thirty-one billion, one hundred twenty million, two hundred twelve thousand, two hundred thirteen".