21552201728 has 48 divisors (see below), whose sum is σ = 43156960155. Its totient is φ = 10762813440.

The previous prime is 21552201719. The next prime is 21552201761. The reversal of 21552201728 is 82710225512.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 10776100864 + 10776100864 = 103808^2 + 103808^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=103808.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 26574443 + ... + 26575253.

Almost surely, 2^21552201728 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 21552201728

21552201728 is an abundant number, since it is smaller than the sum of its proper divisors (21604758427).

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

21552201728 is an frugal number, since it uses more digits than its factorization.

21552201728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652 (or 813 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 35.

The spelling of 21552201728 in words is "twenty-one billion, five hundred fifty-two million, two hundred one thousand, seven hundred twenty-eight".