31033011220 has 72 divisors (see below), whose sum is σ = 69128640000. Its totient is φ = 11700241344.

The previous prime is 31033011209. The next prime is 31033011227. The reversal of 31033011220 is 2211033013.

It is a junction number, because it is equal to n+sod(n) for n = 31033011194 and 31033011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31033011227) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1425981 + ... + 1447579.

It is an arithmetic number, because the mean of its divisors is an integer number (960120000).

Almost surely, 2^31033011220 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 31033011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34564320000).

31033011220 is an abundant number, since it is smaller than the sum of its proper divisors (38095628780).

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

31033011220 is a wasteful number, since it uses less digits than its factorization.

31033011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21845 (or 21824 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31033011220 its reverse (2211033013), we get a palindrome (33244044233).

The spelling of 31033011220 in words is "thirty-one billion, thirty-three million, eleven thousand, two hundred twenty".