31023221212 has 12 divisors (see below), whose sum is σ = 55614799296. Its totient is φ = 15133278560.

The previous prime is 31023221197. The next prime is 31023221213. The reversal of 31023221212 is 21212232013.

It is a self number, because there is not a number n which added to its sum of digits gives 31023221212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023221213) 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, 94582828 + ... + 94583155.

It is an arithmetic number, because the mean of its divisors is an integer number (4634566608).

Almost surely, 2^31023221212 is an apocalyptic number.

It is an amenable number.

31023221212 is a deficient number, since it is larger than the sum of its proper divisors (24591578084).

31023221212 is a wasteful number, since it uses less digits than its factorization.

31023221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189166028 (or 189166026 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31023221212 its reverse (21212232013), we get a palindrome (52235453225).

The spelling of 31023221212 in words is "thirty-one billion, twenty-three million, two hundred twenty-one thousand, two hundred twelve".