31121310222 has 48 divisors (see below), whose sum is σ = 67947319440. Its totient is φ = 10294407936.

The previous prime is 31121310197. The next prime is 31121310251. The reversal of 31121310222 is 22201312113.

31121310222 is a `hidden beast` number, since 311 + 2 + 131 + 0 + 222 = 666.

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 = 31121310195 and 31121310204.

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 23 ways as a sum of consecutive naturals, for example, 1253158 + ... + 1277750.

It is an arithmetic number, because the mean of its divisors is an integer number (1415569155).

Almost surely, 2^31121310222 is an apocalyptic number.

31121310222 is an abundant number, since it is smaller than the sum of its proper divisors (36826009218).

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

31121310222 is a wasteful number, since it uses less digits than its factorization.

31121310222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25137 (or 25134 counting only the distinct ones).

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

Adding to 31121310222 its reverse (22201312113), we get a palindrome (53322622335).

The spelling of 31121310222 in words is "thirty-one billion, one hundred twenty-one million, three hundred ten thousand, two hundred twenty-two".