31212223212 has 24 divisors (see below), whose sum is σ = 72834955200. Its totient is φ = 10403155216.

The previous prime is 31212223183. The next prime is 31212223249. The reversal of 31212223212 is 21232221213.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34339 + ... + 252197.

It is an arithmetic number, because the mean of its divisors is an integer number (3034789800).

Almost surely, 2^31212223212 is an apocalyptic number.

It is an amenable number.

31212223212 is an abundant number, since it is smaller than the sum of its proper divisors (41622731988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31212223212 is a wasteful number, since it uses less digits than its factorization.

31212223212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229805 (or 229803 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

Adding to 31212223212 its reverse (21232221213), we get a palindrome (52444444425).

The spelling of 31212223212 in words is "thirty-one billion, two hundred twelve million, two hundred twenty-three thousand, two hundred twelve".