31132012220 has 24 divisors (see below), whose sum is σ = 65778319824. Its totient is φ = 12376406016.

The previous prime is 31132012193. The next prime is 31132012231. The reversal of 31132012220 is 2221023113.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4771589 + ... + 4778108.

It is an arithmetic number, because the mean of its divisors is an integer number (2740763326).

Almost surely, 2^31132012220 is an apocalyptic number.

It is an amenable number.

31132012220 is an abundant number, since it is smaller than the sum of its proper divisors (34646307604).

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

31132012220 is a wasteful number, since it uses less digits than its factorization.

31132012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9549869 (or 9549867 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31132012220 its reverse (2221023113), we get a palindrome (33353035333).

The spelling of 31132012220 in words is "thirty-one billion, one hundred thirty-two million, twelve thousand, two hundred twenty".