31122220122 has 48 divisors (see below), whose sum is σ = 77107897152. Its totient is φ = 8887060800.

The previous prime is 31122220121. The next prime is 31122220133. The reversal of 31122220122 is 22102222113.

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 = 31122220095 and 31122220104.

It is not an unprimeable number, because it can be changed into a prime (31122220121) by changing a digit.

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, 158353 + ... + 295499.

It is an arithmetic number, because the mean of its divisors is an integer number (1606414524).

Almost surely, 2^31122220122 is an apocalyptic number.

31122220122 is an abundant number, since it is smaller than the sum of its proper divisors (45985677030).

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

31122220122 is a wasteful number, since it uses less digits than its factorization.

31122220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138963 (or 138960 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 31122220122 its reverse (22102222113), we get a palindrome (53224442235).

The spelling of 31122220122 in words is "thirty-one billion, one hundred twenty-two million, two hundred twenty thousand, one hundred twenty-two".