221501030528 has 72 divisors (see below), whose sum is σ = 468947269245. Its totient is φ = 104193181696.

The previous prime is 221501030521. The next prime is 221501030537. The reversal of 221501030528 is 825030105122.

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 2 ways, for example, as 202723261504 + 18777769024 = 450248^2 + 137032^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332792.

It is a self number, because there is not a number n which added to its sum of digits gives 221501030528.

It is not an unprimeable number, because it can be changed into a prime (221501030521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 90518201 + ... + 90520647.

Almost surely, 2^221501030528 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 221501030528

221501030528 is an abundant number, since it is smaller than the sum of its proper divisors (247446238717).

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

221501030528 is an frugal number, since it uses more digits than its factorization.

221501030528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4942 (or 2466 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The spelling of 221501030528 in words is "two hundred twenty-one billion, five hundred one million, thirty thousand, five hundred twenty-eight".