2154521328 has 80 divisors (see below), whose sum is σ = 5778201600. Its totient is φ = 691038720.

The previous prime is 2154521323. The next prime is 2154521357. The reversal of 2154521328 is 8231254512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154521323) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 262308 + ... + 270396.

It is an arithmetic number, because the mean of its divisors is an integer number (72227520).

Almost surely, 2^2154521328 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 2154521328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2889100800).

2154521328 is an abundant number, since it is smaller than the sum of its proper divisors (3623680272).

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

2154521328 is a wasteful number, since it uses less digits than its factorization.

2154521328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8310 (or 8304 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

The square root of 2154521328 is about 46416.8216059652. The cubic root of 2154521328 is about 1291.5669774819.

The spelling of 2154521328 in words is "two billion, one hundred fifty-four million, five hundred twenty-one thousand, three hundred twenty-eight".