31221232231112 has 256 divisors, whose sum is σ = 73817595371520. Its totient is φ = 12026298009600.

The previous prime is 31221232231103. The next prime is 31221232231159. The reversal of 31221232231112 is 21113223212213.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21787321148 + ... + 21787322580.

It is an arithmetic number, because the mean of its divisors is an integer number (288349981920).

Almost surely, 2^{31221232231112} 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 31221232231112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36908797685760).

31221232231112 is an abundant number, since it is smaller than the sum of its proper divisors (42596363140408).

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

31221232231112 is a wasteful number, since it uses less digits than its factorization.

31221232231112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2644 (or 2640 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

Adding to 31221232231112 its reverse (21113223212213), we get a palindrome (52334455443325).

The spelling of 31221232231112 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred thirty-two million, two hundred thirty-one thousand, one hundred twelve".