221020330 has 16 divisors (see below), whose sum is σ = 398273760. Its totient is φ = 88310992.

The previous prime is 221020321. The next prime is 221020333. The reversal of 221020330 is 33020122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221020330.

It is not an unprimeable number, because it can be changed into a prime (221020333) 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, 2200 + ... + 21139.

It is an arithmetic number, because the mean of its divisors is an integer number (24892110).

Almost surely, 2^221020330 is an apocalyptic number.

221020330 is a deficient number, since it is larger than the sum of its proper divisors (177253430).

221020330 is a wasteful number, since it uses less digits than its factorization.

221020330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24293.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 221020330 is about 14866.7525034891. The cubic root of 221020330 is about 604.6128981027.

Adding to 221020330 its reverse (33020122), we get a palindrome (254040452).

The spelling of 221020330 in words is "two hundred twenty-one million, twenty thousand, three hundred thirty".