221013220 has 12 divisors (see below), whose sum is σ = 464127804. Its totient is φ = 88405280.

The previous prime is 221013217. The next prime is 221013251. The reversal of 221013220 is 22310122.

It can be written as a sum of positive squares in 2 ways, for example, as 103550976 + 117462244 = 10176^2 + 10838^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221013220.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5525311 + ... + 5525350.

It is an arithmetic number, because the mean of its divisors is an integer number (38677317).

Almost surely, 2^221013220 is an apocalyptic number.

221013220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221013220 is an abundant number, since it is smaller than the sum of its proper divisors (243114584).

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

221013220 is a wasteful number, since it uses less digits than its factorization.

221013220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11050670 (or 11050668 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 221013220 is about 14866.5133773861. The cubic root of 221013220 is about 604.6064147718.

Adding to 221013220 its reverse (22310122), we get a palindrome (243323342).

The spelling of 221013220 in words is "two hundred twenty-one million, thirteen thousand, two hundred twenty".