221320530 has 48 divisors (see below), whose sum is σ = 576799704. Its totient is φ = 58878720.

The previous prime is 221320523. The next prime is 221320543. The reversal of 221320530 is 35023122.

221320530 is a `hidden beast` number, since 2 + 2 + 132 + 0 + 530 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 195524289 + 25796241 = 13983^2 + 5079^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38440 + ... + 43820.

Almost surely, 2^221320530 is an apocalyptic number.

221320530 is an abundant number, since it is smaller than the sum of its proper divisors (355479174).

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

221320530 is a wasteful number, since it uses less digits than its factorization.

221320530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5851 (or 5848 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 221320530 is about 14876.8454317439. The cubic root of 221320530 is about 604.8865119642.

Adding to 221320530 its reverse (35023122), we get a palindrome (256343652).

The spelling of 221320530 in words is "two hundred twenty-one million, three hundred twenty thousand, five hundred thirty".