31221212012 has 12 divisors (see below), whose sum is σ = 54745747056. Its totient is φ = 15579570000.

The previous prime is 31221212003. The next prime is 31221212027. The reversal of 31221212012 is 21021212213.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7756739 + ... + 7760762.

It is an arithmetic number, because the mean of its divisors is an integer number (4562145588).

Almost surely, 2^31221212012 is an apocalyptic number.

It is an amenable number.

31221212012 is a deficient number, since it is larger than the sum of its proper divisors (23524535044).

31221212012 is a wasteful number, since it uses less digits than its factorization.

31221212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15518008 (or 15518006 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 31221212012 its reverse (21021212213), we get a palindrome (52242424225).

The spelling of 31221212012 in words is "thirty-one billion, two hundred twenty-one million, two hundred twelve thousand, twelve".