31122212120 has 64 divisors (see below), whose sum is σ = 74276701920. Its totient is φ = 11695642624.

The previous prime is 31122212117. The next prime is 31122212161. The reversal of 31122212120 is 2121222113.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 15 ways as a sum of consecutive naturals, for example, 342194 + ... + 423486.

Almost surely, 2^31122212120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31122212120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37138350960).

31122212120 is an abundant number, since it is smaller than the sum of its proper divisors (43154489800).

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

31122212120 is a wasteful number, since it uses less digits than its factorization.

31122212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81884 (or 81880 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 31122212120 its reverse (2121222113), we get a palindrome (33243434233).

The spelling of 31122212120 in words is "thirty-one billion, one hundred twenty-two million, two hundred twelve thousand, one hundred twenty".