31032220000 has 120 divisors (see below), whose sum is σ = 77970616416. Its totient is φ = 12148416000.

The previous prime is 31032219971. The next prime is 31032220001. The reversal of 31032220000 is 2223013.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31032220001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 923494 + ... + 956506.

Almost surely, 2^31032220000 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 31032220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38985308208).

31032220000 is an abundant number, since it is smaller than the sum of its proper divisors (46938396416).

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

31032220000 is an equidigital number, since it uses as much as digits as its factorization.

31032220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33090 (or 33067 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 31032220000 its reverse (2223013), we get a palindrome (31034443013).

The spelling of 31032220000 in words is "thirty-one billion, thirty-two million, two hundred twenty thousand".