31213324212 has 96 divisors (see below), whose sum is σ = 84395001600. Its totient is φ = 8794401792.

The previous prime is 31213324189. The next prime is 31213324213. The reversal of 31213324212 is 21242331213.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213324213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2902798 + ... + 2913530.

It is an arithmetic number, because the mean of its divisors is an integer number (879114600).

Almost surely, 2^31213324212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31213324212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42197500800).

31213324212 is an abundant number, since it is smaller than the sum of its proper divisors (53181677388).

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

31213324212 is a wasteful number, since it uses less digits than its factorization.

31213324212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11225 (or 11223 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

Adding to 31213324212 its reverse (21242331213), we get a palindrome (52455655425).

The spelling of 31213324212 in words is "thirty-one billion, two hundred thirteen million, three hundred twenty-four thousand, two hundred twelve".