31112233212 has 72 divisors (see below), whose sum is σ = 75505248000. Its totient is φ = 9970463552.

The previous prime is 31112233211. The next prime is 31112233219. The reversal of 31112233212 is 21233221113.

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 (31112233211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2405539 + ... + 2418437.

It is an arithmetic number, because the mean of its divisors is an integer number (1048684000).

Almost surely, 2^31112233212 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 31112233212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37752624000).

31112233212 is an abundant number, since it is smaller than the sum of its proper divisors (44393014788).

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

31112233212 is a wasteful number, since it uses less digits than its factorization.

31112233212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13203 (or 13172 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

Adding to 31112233212 its reverse (21233221113), we get a palindrome (52345454325).

The spelling of 31112233212 in words is "thirty-one billion, one hundred twelve million, two hundred thirty-three thousand, two hundred twelve".