21784801324 has 48 divisors (see below), whose sum is σ = 44804471040. Its totient is φ = 9137183040.

The previous prime is 21784801309. The next prime is 21784801331. The reversal of 21784801324 is 42310848712.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2204707 + ... + 2214565.

It is an arithmetic number, because the mean of its divisors is an integer number (933426480).

Almost surely, 2^21784801324 is an apocalyptic number.

It is an amenable number.

21784801324 is an abundant number, since it is smaller than the sum of its proper divisors (23019669716).

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

21784801324 is a wasteful number, since it uses less digits than its factorization.

21784801324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13750 (or 13748 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The spelling of 21784801324 in words is "twenty-one billion, seven hundred eighty-four million, eight hundred one thousand, three hundred twenty-four".