21584407480 has 16 divisors (see below), whose sum is σ = 48564916920. Its totient is φ = 8633762976.

The previous prime is 21584407447. The next prime is 21584407487. The reversal of 21584407480 is 8470448512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21584407487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269805054 + ... + 269805133.

Almost surely, 2^21584407480 is an apocalyptic number.

21584407480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21584407480 is an abundant number, since it is smaller than the sum of its proper divisors (26980509440).

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

21584407480 is a wasteful number, since it uses less digits than its factorization.

21584407480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539610198 (or 539610194 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 43.

The spelling of 21584407480 in words is "twenty-one billion, five hundred eighty-four million, four hundred seven thousand, four hundred eighty".