31230012212 has 18 divisors (see below), whose sum is σ = 63575382402. Its totient is φ = 13384290864.

The previous prime is 31230012161. The next prime is 31230012241. The reversal of 31230012212 is 21221003213.

It can be written as a sum of positive squares in only one way, i.e., 23741879056 + 7488133156 = 154084^2 + 86534^2 .

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 5 ways as a sum of consecutive naturals, for example, 79668203 + ... + 79668594.

It is an arithmetic number, because the mean of its divisors is an integer number (3531965689).

Almost surely, 2^31230012212 is an apocalyptic number.

It is an amenable number.

31230012212 is an abundant number, since it is smaller than the sum of its proper divisors (32345370190).

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

31230012212 is a wasteful number, since it uses less digits than its factorization.

31230012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159336815 (or 159336806 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31230012212 its reverse (21221003213), we get a palindrome (52451015425).

It can be divided in two parts, 3123001 and 2212, that added together give a palindrome (3125213).

The spelling of 31230012212 in words is "thirty-one billion, two hundred thirty million, twelve thousand, two hundred twelve".