31130121222 has 48 divisors (see below), whose sum is σ = 68271931728. Its totient is φ = 10250510400.

The previous prime is 31130121179. The next prime is 31130121223. The reversal of 31130121222 is 22212103113.

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

It is a junction number, because it is equal to n+sod(n) for n = 31130121195 and 31130121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130121223) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 786048 + ... + 824700.

It is an arithmetic number, because the mean of its divisors is an integer number (1422331911).

Almost surely, 2^31130121222 is an apocalyptic number.

31130121222 is an abundant number, since it is smaller than the sum of its proper divisors (37141810506).

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

31130121222 is a wasteful number, since it uses less digits than its factorization.

31130121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39205 (or 39202 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31130121222 its reverse (22212103113), we get a palindrome (53342224335).

The spelling of 31130121222 in words is "thirty-one billion, one hundred thirty million, one hundred twenty-one thousand, two hundred twenty-two".