31223224213 has 4 divisors (see below), whose sum is σ = 31461569568. Its totient is φ = 30984878860.

The previous prime is 31223224171. The next prime is 31223224223. The reversal of 31223224213 is 31242232213.

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 31223224213 - 2⁹ = 31223223701 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 (31223224223) 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, 119172481 + ... + 119172742.

It is an arithmetic number, because the mean of its divisors is an integer number (7865392392).

Almost surely, 2^31223224213 is an apocalyptic number.

It is an amenable number.

31223224213 is a deficient number, since it is larger than the sum of its proper divisors (238345355).

31223224213 is a wasteful number, since it uses less digits than its factorization.

31223224213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238345354.

The product of its digits is 3456, while the sum is 25.

Adding to 31223224213 its reverse (31242232213), we get a palindrome (62465456426).

The spelling of 31223224213 in words is "thirty-one billion, two hundred twenty-three million, two hundred twenty-four thousand, two hundred thirteen".