31212222012 has 36 divisors (see below), whose sum is σ = 78905572200. Its totient is φ = 10403017632.

The previous prime is 31212221959. The next prime is 31212222043. The reversal of 31212222012 is 21022221213.

31212222012 is a `hidden beast` number, since 312 + 122 + 220 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 368398 + ... + 445130.

It is an arithmetic number, because the mean of its divisors is an integer number (2191821450).

Almost surely, 2^31212222012 is an apocalyptic number.

It is an amenable number.

31212222012 is an abundant number, since it is smaller than the sum of its proper divisors (47693350188).

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

31212222012 is a wasteful number, since it uses less digits than its factorization.

31212222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88042 (or 88037 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 31212222012 its reverse (21022221213), we get a palindrome (52234443225).

The spelling of 31212222012 in words is "thirty-one billion, two hundred twelve million, two hundred twenty-two thousand, twelve".