31122222120 has 96 divisors (see below), whose sum is σ = 110342437920. Its totient is φ = 7544780160.

The previous prime is 31122222107. The next prime is 31122222127. The reversal of 31122222120 is 2122222113.

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 = 31122222093 and 31122222102.

It is not an unprimeable number, because it can be changed into a prime (31122222127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3925614 + ... + 3933533.

It is an arithmetic number, because the mean of its divisors is an integer number (1149400395).

Almost surely, 2^31122222120 is an apocalyptic number.

31122222120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31122222120 is an abundant number, since it is smaller than the sum of its proper divisors (79220215800).

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

31122222120 is a wasteful number, since it uses less digits than its factorization.

31122222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7859175 (or 7859168 counting only the distinct ones).

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

Adding to 31122222120 its reverse (2122222113), we get a palindrome (33244444233).

The spelling of 31122222120 in words is "thirty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty".