31020321222 has 128 divisors (see below), whose sum is σ = 76340275200. Its totient is φ = 9258624000.

The previous prime is 31020321203. The next prime is 31020321239. The reversal of 31020321222 is 22212302013.

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 = 31020321195 and 31020321204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13193347 + ... + 13195697.

It is an arithmetic number, because the mean of its divisors is an integer number (596408400).

Almost surely, 2^31020321222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31020321222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38170137600).

31020321222 is an abundant number, since it is smaller than the sum of its proper divisors (45319953978).

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

31020321222 is a wasteful number, since it uses less digits than its factorization.

31020321222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2699 (or 2693 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31020321222 its reverse (22212302013), we get a palindrome (53232623235).

The spelling of 31020321222 in words is "thirty-one billion, twenty million, three hundred twenty-one thousand, two hundred twenty-two".