21546529416 has 160 divisors (see below), whose sum is σ = 65576966400. Its totient is φ = 6584561280.

The previous prime is 21546529343. The next prime is 21546529439. The reversal of 21546529416 is 61492564512.

21546529416 is a `hidden beast` number, since 2 + 1 + 546 + 5 + 2 + 94 + 16 = 666.

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 39 ways as a sum of consecutive naturals, for example, 353446 + ... + 409898.

It is an arithmetic number, because the mean of its divisors is an integer number (409856040).

Almost surely, 2^21546529416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21546529416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32788483200).

21546529416 is an abundant number, since it is smaller than the sum of its proper divisors (44030436984).

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

21546529416 is a wasteful number, since it uses less digits than its factorization.

21546529416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56521 (or 56508 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The spelling of 21546529416 in words is "twenty-one billion, five hundred forty-six million, five hundred twenty-nine thousand, four hundred sixteen".