220323021 has 16 divisors (see below), whose sum is σ = 298195200. Its totient is φ = 144675648.

The previous prime is 220323017. The next prime is 220323071. The reversal of 220323021 is 120323022.

It is not a de Polignac number, because 220323021 - 2² = 220323017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220323071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131175 + ... + 132843.

It is an arithmetic number, because the mean of its divisors is an integer number (18637200).

Almost surely, 2^220323021 is an apocalyptic number.

It is an amenable number.

220323021 is a deficient number, since it is larger than the sum of its proper divisors (77872179).

220323021 is a wasteful number, since it uses less digits than its factorization.

220323021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 220323021 is about 14843.2820157807. The cubic root of 220323021 is about 603.9763862601.

Adding to 220323021 its reverse (120323022), we get a palindrome (340646043).

Subtracting from 220323021 its reverse (120323022), we obtain a palindrome (99999999).

The spelling of 220323021 in words is "two hundred twenty million, three hundred twenty-three thousand, twenty-one".