31212211021212 has 96 divisors (see below), whose sum is σ = 80458616512512. Its totient is φ = 9357271612416.

The previous prime is 31212211021193. The next prime is 31212211021217. The reversal of 31212211021212 is 21212011221213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212211021217) 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, 7909773 + ... + 11179844.

It is an arithmetic number, because the mean of its divisors is an integer number (838110588672).

Almost surely, 2^{31212211021212} is an apocalyptic number.

It is an amenable number.

31212211021212 is an abundant number, since it is smaller than the sum of its proper divisors (49246405491300).

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

31212211021212 is a wasteful number, since it uses less digits than its factorization.

31212211021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19089907 (or 19089905 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 31212211021212 its reverse (21212011221213), we get a palindrome (52424222242425).

The spelling of 31212211021212 in words is "thirty-one trillion, two hundred twelve billion, two hundred eleven million, twenty-one thousand, two hundred twelve".