2521408881920 has 54 divisors (see below), whose sum is σ = 6039698293818. Its totient is φ = 1008540828672.

The previous prime is 2521408881839. The next prime is 2521408881923. The reversal of 2521408881920 is 291888041252.

It can be written as a sum of positive squares in only one way, i.e., 2017127105536 + 504281776384 = 1420256^2 + 710128^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521408881923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56788049 + ... + 56832431.

Almost surely, 2^{2521408881920} is an apocalyptic number.

2521408881920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2521408881920 is an abundant number, since it is smaller than the sum of its proper divisors (3518289411898).

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

2521408881920 is an frugal number, since it uses more digits than its factorization.

2521408881920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88787 (or 44390 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 50.

The spelling of 2521408881920 in words is "two trillion, five hundred twenty-one billion, four hundred eight million, eight hundred eighty-one thousand, nine hundred twenty".