21715834480 has 40 divisors (see below), whose sum is σ = 51097635792. Its totient is φ = 8581676544.

The previous prime is 21715834453. The next prime is 21715834487. The reversal of 21715834480 is 8443851712.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21715834487) 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 7 ways as a sum of consecutive naturals, for example, 1628589 + ... + 1641868.

Almost surely, 2^21715834480 is an apocalyptic number.

21715834480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21715834480 is an abundant number, since it is smaller than the sum of its proper divisors (29381801312).

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

21715834480 is a wasteful number, since it uses less digits than its factorization.

21715834480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270553 (or 3270547 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 21715834480 in words is "twenty-one billion, seven hundred fifteen million, eight hundred thirty-four thousand, four hundred eighty".