31121232212 has 36 divisors (see below), whose sum is σ = 63981244404. Its totient is φ = 13205606400.

The previous prime is 31121232199. The next prime is 31121232239. The reversal of 31121232212 is 21223212113.

It can be written as a sum of positive squares in 2 ways, for example, as 21000067396 + 10121164816 = 144914^2 + 100604^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 766253 + ... + 805844.

It is an arithmetic number, because the mean of its divisors is an integer number (1777256789).

Almost surely, 2^31121232212 is an apocalyptic number.

It is an amenable number.

31121232212 is an abundant number, since it is smaller than the sum of its proper divisors (32860012192).

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

31121232212 is a wasteful number, since it uses less digits than its factorization.

31121232212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572216 (or 1572207 counting only the distinct ones).

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

Adding to 31121232212 its reverse (21223212113), we get a palindrome (52344444325).

The spelling of 31121232212 in words is "thirty-one billion, one hundred twenty-one million, two hundred thirty-two thousand, two hundred twelve".