31212232213 has 4 divisors (see below), whose sum is σ = 31607323840. Its totient is φ = 30817140588.

The previous prime is 31212232211. The next prime is 31212232229. The reversal of 31212232213 is 31223221213.

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 31212232213 - 2¹ = 31212232211 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 (31212232211) 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, 197545695 + ... + 197545852.

It is an arithmetic number, because the mean of its divisors is an integer number (7901830960).

Almost surely, 2^31212232213 is an apocalyptic number.

It is an amenable number.

31212232213 is a deficient number, since it is larger than the sum of its proper divisors (395091627).

31212232213 is an equidigital number, since it uses as much as digits as its factorization.

31212232213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395091626.

The product of its digits is 864, while the sum is 22.

Adding to 31212232213 its reverse (31223221213), we get a palindrome (62435453426).

The spelling of 31212232213 in words is "thirty-one billion, two hundred twelve million, two hundred thirty-two thousand, two hundred thirteen".