31332221440 has 120 divisors (see below), whose sum is σ = 81348301188. Its totient is φ = 11568660480.

The previous prime is 31332221411. The next prime is 31332221447. The reversal of 31332221440 is 4412223313.

It can be written as a sum of positive squares in 6 ways, for example, as 4556790016 + 26775431424 = 67504^2 + 163632^2 .

It is not an unprimeable number, because it can be changed into a prime (31332221447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 396430 + ... + 468850.

Almost surely, 2^31332221440 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 31332221440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40674150594).

31332221440 is an abundant number, since it is smaller than the sum of its proper divisors (50016079748).

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

31332221440 is an equidigital number, since it uses as much as digits as its factorization.

31332221440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72470 (or 72441 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 31332221440 its reverse (4412223313), we get a palindrome (35744444753).

The spelling of 31332221440 in words is "thirty-one billion, three hundred thirty-two million, two hundred twenty-one thousand, four hundred forty".