2521430240 has 72 divisors (see below), whose sum is σ = 6929452152. Its totient is φ = 864487680.

The previous prime is 2521430239. The next prime is 2521430287. The reversal of 2521430240 is 420341252.

It is a happy number.

It is a super-2 number, since 2×2521430240² = 12715220910372915200, 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 11 ways as a sum of consecutive naturals, for example, 152966 + ... + 168645.

It is an arithmetic number, because the mean of its divisors is an integer number (96242391).

Almost surely, 2^2521430240 is an apocalyptic number.

2521430240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2521430240 is an abundant number, since it is smaller than the sum of its proper divisors (4408021912).

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

2521430240 is a wasteful number, since it uses less digits than its factorization.

2521430240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321640 (or 321625 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 2521430240 is about 50213.8451027204. The cubic root of 2521430240 is about 1361.0758211863.

Adding to 2521430240 its reverse (420341252), we get a palindrome (2941771492).

The spelling of 2521430240 in words is "two billion, five hundred twenty-one million, four hundred thirty thousand, two hundred forty".