221315530 has 16 divisors (see below), whose sum is σ = 412105320. Its totient is φ = 85473472.

The previous prime is 221315519. The next prime is 221315531. The reversal of 221315530 is 35513122.

It can be written as a sum of positive squares in 4 ways, for example, as 103571329 + 117744201 = 10177^2 + 10851^2 .

It is not an unprimeable number, because it can be changed into a prime (221315531) 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 7 ways as a sum of consecutive naturals, for example, 381289 + ... + 381868.

Almost surely, 2^221315530 is an apocalyptic number.

221315530 is a deficient number, since it is larger than the sum of its proper divisors (190789790).

221315530 is a wasteful number, since it uses less digits than its factorization.

221315530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763193.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 221315530 is about 14876.6773844162. The cubic root of 221315530 is about 604.8819567981.

Adding to 221315530 its reverse (35513122), we get a palindrome (256828652).

The spelling of 221315530 in words is "two hundred twenty-one million, three hundred fifteen thousand, five hundred thirty".