31213212212 has 24 divisors (see below), whose sum is σ = 67228457856. Its totient is φ = 12348083808.

The previous prime is 31213212211. The next prime is 31213212223. The reversal of 31213212212 is 21221231213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213212211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42874928 + ... + 42875655.

It is an arithmetic number, because the mean of its divisors is an integer number (2801185744).

Almost surely, 2^31213212212 is an apocalyptic number.

It is an amenable number.

31213212212 is an abundant number, since it is smaller than the sum of its proper divisors (36015245644).

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

31213212212 is a wasteful number, since it uses less digits than its factorization.

31213212212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85750607 (or 85750605 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

Adding to 31213212212 its reverse (21221231213), we get a palindrome (52434443425).

The spelling of 31213212212 in words is "thirty-one billion, two hundred thirteen million, two hundred twelve thousand, two hundred twelve".