31233212213 has 4 divisors (see below), whose sum is σ = 35695099680. Its totient is φ = 26771324748.

The previous prime is 31233212203. The next prime is 31233212233. The reversal of 31233212213 is 31221233213.

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 de Polignac number, because none of the positive numbers 2^k-31233212213 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 (31233212203) 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, 2230943723 + ... + 2230943736.

It is an arithmetic number, because the mean of its divisors is an integer number (8923774920).

Almost surely, 2^31233212213 is an apocalyptic number.

It is an amenable number.

31233212213 is a deficient number, since it is larger than the sum of its proper divisors (4461887467).

31233212213 is an equidigital number, since it uses as much as digits as its factorization.

31233212213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4461887466.

The product of its digits is 1296, while the sum is 23.

Adding to 31233212213 its reverse (31221233213), we get a palindrome (62454445426).

The spelling of 31233212213 in words is "thirty-one billion, two hundred thirty-three million, two hundred twelve thousand, two hundred thirteen".