31211111213 has 4 divisors (see below), whose sum is σ = 31211704320. Its totient is φ = 31210518108.

The previous prime is 31211111179. The next prime is 31211111233.

31211111213 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31211111213 - 2⁶ = 31211111149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31211111191 and 31211111200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211111233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209003 + ... + 325736.

It is an arithmetic number, because the mean of its divisors is an integer number (7802926080).

Almost surely, 2^31211111213 is an apocalyptic number.

It is an amenable number.

31211111213 is a deficient number, since it is larger than the sum of its proper divisors (593107).

31211111213 is an equidigital number, since it uses as much as digits as its factorization.

31211111213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593106.

The product of its digits is 36, while the sum is 17.

The spelling of 31211111213 in words is "thirty-one billion, two hundred eleven million, one hundred eleven thousand, two hundred thirteen".