31212121222112 has 24 divisors (see below), whose sum is σ = 61452651040200. Its totient is φ = 15605098735744.

The previous prime is 31212121222099. The next prime is 31212121222169. The reversal of 31212121222112 is 21122212121213.

It is a super-2 number, since 2×31212121222112² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29531162 + ... + 30569817.

It is an arithmetic number, because the mean of its divisors is an integer number (2560527126675).

Almost surely, 2^{31212121222112} is an apocalyptic number.

31212121222112 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31212121222112 is a deficient number, since it is larger than the sum of its proper divisors (30240529818088).

31212121222112 is a wasteful number, since it uses less digits than its factorization.

31212121222112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60117218 (or 60117210 counting only the distinct ones).

The product of its digits is 384, while the sum is 23.

Adding to 31212121222112 its reverse (21122212121213), we get a palindrome (52334333343325).

The spelling of 31212121222112 in words is "thirty-one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred twelve".