2331221640 has 128 divisors (see below), whose sum is σ = 7697462400. Its totient is φ = 560107520.

The previous prime is 2331221623. The next prime is 2331221647. The reversal of 2331221640 is 461221332.

2331221640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2331221640.

It is not an unprimeable number, because it can be changed into a prime (2331221647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141346 + ... + 156974.

It is an arithmetic number, because the mean of its divisors is an integer number (60136425).

Almost surely, 2^2331221640 is an apocalyptic number.

2331221640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2331221640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3848731200).

2331221640 is an abundant number, since it is smaller than the sum of its proper divisors (5366240760).

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

2331221640 is a wasteful number, since it uses less digits than its factorization.

2331221640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15767 (or 15763 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 2331221640 is about 48282.7261036491. The cubic root of 2331221640 is about 1325.9521605057.

Adding to 2331221640 its reverse (461221332), we get a palindrome (2792442972).

The spelling of 2331221640 in words is "two billion, three hundred thirty-one million, two hundred twenty-one thousand, six hundred forty".