21519281040 has 80 divisors (see below), whose sum is σ = 66742008000. Its totient is φ = 5735702016.

The previous prime is 21519281029. The next prime is 21519281057. The reversal of 21519281040 is 4018291512.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 21519280992 and 21519281010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502386 + ... + 543534.

It is an arithmetic number, because the mean of its divisors is an integer number (834275100).

Almost surely, 2^21519281040 is an apocalyptic number.

21519281040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21519281040 is an abundant number, since it is smaller than the sum of its proper divisors (45222726960).

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

21519281040 is a wasteful number, since it uses less digits than its factorization.

21519281040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43344 (or 43338 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 33.

The spelling of 21519281040 in words is "twenty-one billion, five hundred nineteen million, two hundred eighty-one thousand, forty".