221034528 has 192 divisors, whose sum is σ = 757814400. Its totient is φ = 61793280.

The previous prime is 221034523. The next prime is 221034529. The reversal of 221034528 is 825430122.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (221034523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122658 + ... + 124446.

It is an arithmetic number, because the mean of its divisors is an integer number (3946950).

Almost surely, 2^221034528 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 221034528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (378907200).

221034528 is an abundant number, since it is smaller than the sum of its proper divisors (536779872).

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

221034528 is a wasteful number, since it uses less digits than its factorization.

221034528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832 (or 1818 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 221034528 is about 14867.2300042745. The cubic root of 221034528 is about 604.6258442875.

The spelling of 221034528 in words is "two hundred twenty-one million, thirty-four thousand, five hundred twenty-eight".