2521331640 has 96 divisors (see below), whose sum is σ = 8204320800. Its totient is φ = 671535360.

The previous prime is 2521331611. The next prime is 2521331651. The reversal of 2521331640 is 461331252.

2521331640 is a `hidden beast` number, since 2 + 5 + 2 + 13 + 3 + 1 + 640 = 666.

2521331640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2521331640² = 12714226477730179200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 327030 + ... + 334650.

It is an arithmetic number, because the mean of its divisors is an integer number (85461675).

Almost surely, 2^2521331640 is an apocalyptic number.

2521331640 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 2521331640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4102160400).

2521331640 is an abundant number, since it is smaller than the sum of its proper divisors (5682989160).

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

2521331640 is a wasteful number, since it uses less digits than its factorization.

2521331640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8557 (or 8550 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 2521331640 is about 50212.8632921884. The cubic root of 2521331640 is about 1361.0580794270.

Adding to 2521331640 its reverse (461331252), we get a palindrome (2982662892).

The spelling of 2521331640 in words is "two billion, five hundred twenty-one million, three hundred thirty-one thousand, six hundred forty".