31231131100212 has 24 divisors (see below), whose sum is σ = 77159265071616. Its totient is φ = 9798001913728.

The previous prime is 31231131100157. The next prime is 31231131100219. The reversal of 31231131100212 is 21200113113213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231131100219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76546889748 + ... + 76546890155.

It is an arithmetic number, because the mean of its divisors is an integer number (3214969377984).

Almost surely, 2^{31231131100212} is an apocalyptic number.

It is an amenable number.

31231131100212 is an abundant number, since it is smaller than the sum of its proper divisors (45928133971404).

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

31231131100212 is a wasteful number, since it uses less digits than its factorization.

31231131100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153093779927 (or 153093779925 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 31231131100212 its reverse (21200113113213), we get a palindrome (52431244213425).

The spelling of 31231131100212 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred thirty-one million, one hundred thousand, two hundred twelve".