31223212 has 12 divisors (see below), whose sum is σ = 54710656. Its totient is φ = 15591600.

The previous prime is 31223209. The next prime is 31223219. The reversal of 31223212 is 21232213.

It is not an unprimeable number, because it can be changed into a prime (31223219) 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, 1164 + ... + 7987.

Almost surely, 2^31223212 is an apocalyptic number.

It is an amenable number.

31223212 is a deficient number, since it is larger than the sum of its proper divisors (23487444).

31223212 is a wasteful number, since it uses less digits than its factorization.

31223212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10008 (or 10006 counting only the distinct ones).

The product of its digits is 144, while the sum is 16.

The square root of 31223212 is about 5587.7734384995. The cubic root of 31223212 is about 314.8902347042.

Adding to 31223212 its reverse (21232213), we get a palindrome (52455425).

Subtracting from 31223212 its reverse (21232213), we obtain a palindrome (9990999).

The spelling of 31223212 in words is "thirty-one million, two hundred twenty-three thousand, two hundred twelve".