2521216540 has 48 divisors (see below), whose sum is σ = 5356884960. Its totient is φ = 996652800.

The previous prime is 2521216493. The next prime is 2521216541. The reversal of 2521216540 is 456121252.

It is a junction number, because it is equal to n+sod(n) for n = 2521216499 and 2521216508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521216541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1734454 + ... + 1735906.

It is an arithmetic number, because the mean of its divisors is an integer number (111601770).

Almost surely, 2^2521216540 is an apocalyptic number.

2521216540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2521216540 is an abundant number, since it is smaller than the sum of its proper divisors (2835668420).

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

2521216540 is a wasteful number, since it uses less digits than its factorization.

2521216540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422 (or 2420 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 2521216540 is about 50211.7171584482. The cubic root of 2521216540 is about 1361.0373681269.

Adding to 2521216540 its reverse (456121252), we get a palindrome (2977337792).

The spelling of 2521216540 in words is "two billion, five hundred twenty-one million, two hundred sixteen thousand, five hundred forty".