21927529728 has 432 divisors, whose sum is σ = 73121892480. Its totient is φ = 6262603776.

The previous prime is 21927529717. The next prime is 21927529769. The reversal of 21927529728 is 82792572912.

21927529728 is a `hidden beast` number, since 2 + 1 + 92 + 7 + 529 + 7 + 28 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30161301 + ... + 30162027.

It is an arithmetic number, because the mean of its divisors is an integer number (169263640).

Almost surely, 2^21927529728 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 21927529728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36560946240).

21927529728 is an abundant number, since it is smaller than the sum of its proper divisors (51194362752).

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

21927529728 is a wasteful number, since it uses less digits than its factorization.

21927529728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834 (or 817 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The spelling of 21927529728 in words is "twenty-one billion, nine hundred twenty-seven million, five hundred twenty-nine thousand, seven hundred twenty-eight".