31223223213 has 48 divisors (see below), whose sum is σ = 55220961600. Its totient is φ = 15500588544.

The previous prime is 31223223209. The next prime is 31223223217. The reversal of 31223223213 is 31232232213.

It is an interprime number because it is at equal distance from previous prime (31223223209) and next prime (31223223217).

It is not a de Polignac number, because 31223223213 - 2² = 31223223209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31223223217) 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 47 ways as a sum of consecutive naturals, for example, 448063 + ... + 513036.

It is an arithmetic number, because the mean of its divisors is an integer number (1150436700).

Almost surely, 2^31223223213 is an apocalyptic number.

It is an amenable number.

31223223213 is a deficient number, since it is larger than the sum of its proper divisors (23997738387).

31223223213 is a wasteful number, since it uses less digits than its factorization.

31223223213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961146 (or 961139 counting only the distinct ones).

The product of its digits is 2592, while the sum is 24.

Adding to 31223223213 its reverse (31232232213), we get a palindrome (62455455426).

The spelling of 31223223213 in words is "thirty-one billion, two hundred twenty-three million, two hundred twenty-three thousand, two hundred thirteen".